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2c9739799b3d3af26bbccc5cf443056706eb6e19
carbon-lang/toolchain/parse/testdata/struct/struct_pattern.carbon
T
Chandler Carruth 2c9739799b Render diagnostics through the terminal library (#7683) 
Diagnostic rendering was part of the data model: `Loc::FormatLocation`
and
`Loc::FormatSnippet` wrote plain text to a stream, so no capability,
color, or
terminal width could reach them.

A diagnostic is now one message with labels, contexts, and location
information
attached, and `Diagnostics::Renderer` draws it into a
`Terminal::Buffer`. The
design is in `toolchain/docs/diagnostics_rendering.md` (#7668),
authoring in
`toolchain/docs/diagnostics.md`.

Before:

```
example.carbon:6:3: error: 1 argument passed to function expecting 0 arguments
  Run0(1);
  ^~~~~~~
example.carbon:3:1: note: calling function declared here
fn Run0() {}
^~~~~~~~~~~
```

After:

```
error: 1 argument passed to function expecting 0 arguments
       ╭─┤ example.carbon:6:3
       ┆
     3 │ fn Run0() {}
       · ─────┬─────
       ·      ╰──┤ calling function declared here
       ┆
->   6 │   Run0(1);
       ·   ───────
       ╰────────────
```

`--no-diagnostic-snippets` gives a compact form, `example.carbon:6:3-9`.
File
tests use it; the rendering tests under `toolchain/diagnostics/testdata`
ask for
snippets.

C++ interop diagnostics are data now rather than text Clang drew:
`SemIR::ClangSourceLocId` names a `clang::SourceRange`, and a Clang
location is
marked as the point it names.

`StreamConsumer` moves to a `:renderer` target that `:emitter` does not
depend
on, keeping `common/terminal` out of `consumer.h`. Capabilities come
from the
file behind the error stream, so tests get plain ASCII.

`renderer_fuzzer` draws diagnostics built from fuzzer bytes with every
capability combination, since a shape the renderer doesn't expect must
never be
why the compiler dies while reporting a problem.

TODOs mark the follow-ups: line weights and crossing lines, wrapping
that keeps
a quoted type whole, and ordering diagnostics that share a byte offset.

Also: `IncorrectExtension`'s hint moves into its message, since its note
had no
location of its own, and `strip_noise` in `check_diagnostics.py` blanks
multi-line `#define`s instead of deleting them.

Assisted-by: Claude Code
2026-10-15 06:08:57 +00:00

1060 lines
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/struct/struct_pattern.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/struct/struct_pattern.carbon
// --- struct_pattern_empty.carbon
let {} = {};
// --- struct_pattern_one_entry.carbon
let {.x = y: i32} = {};
// --- struct_pattern_trailing_comma.carbon
let {.x = y: i32,} = {};
// --- struct_pattern_two_entries.carbon
let {.x = y: i32, .m = n: i32} = {};
// --- struct_value_literal_as_pattern.carbon
let {.x = 1, .y = 2};
// --- struct_pattern_discard.carbon
let {.x = y: i32, _} = {};
// --- struct_pattern_unnamed.carbon
let {.x = _: i32} = {};
// --- struct_pattern_shorthand.carbon
let {x: i32, y: i32} = {};
// --- struct_pattern_shorthand_ref.carbon
let {ref x: i32, y: i32} = {};
// --- struct_pattern_shorthand_mixed.carbon
let {.x = y: i32, m: i32} = {};
// --- struct_pattern_designated_tuple.carbon
let{x: i32, .y = (a: i32, b: i32)} = {};
// --- struct_pattern_designated_struct.carbon
let{x: i32, .y = {a: i32, b: i32}} = {};
// --- fail_struct_pattern_comma_only.carbon
// CHECK:STDERR: fail_struct_pattern_comma_only.carbon:[[@LINE+2]]:6: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {,} = {};
// --- fail_struct_pattern_missing_designator.carbon
// CHECK:STDERR: fail_struct_pattern_missing_designator.carbon:[[@LINE+2]]:6: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {= y: i32} = {};
// --- fail_struct_pattern_invalid_designator.carbon
// CHECK:STDERR: fail_struct_pattern_invalid_designator.carbon:[[@LINE+2]]:7: error: expected identifier after `.` [ExpectedIdentifierAfterPeriodOrArrow]
// CHECK:STDERR:
let {.7 = y: i32} = {};
// --- fail_struct_pattern_designator_only.carbon
// CHECK:STDERR: fail_struct_pattern_designator_only.carbon:[[@LINE+2]]:8: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x} = {};
// --- fail_struct_type_literal_as_pattern.carbon
// CHECK:STDERR: fail_struct_type_literal_as_pattern.carbon:[[@LINE+2]]:8: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x: i32} = {};
// --- fail_struct_pattern_period_only.carbon
// CHECK:STDERR: fail_struct_pattern_period_only.carbon:[[@LINE+2]]:7: error: expected identifier after `.` [ExpectedIdentifierAfterPeriodOrArrow]
// CHECK:STDERR:
let {.} = {};
// --- fail_struct_pattern_repeated_comma.carbon
// CHECK:STDERR: fail_struct_pattern_repeated_comma.carbon:[[@LINE+2]]:18: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {.x = x: i32,,} = {};
// --- fail_struct_pattern_missing_comma.carbon
// CHECK:STDERR: fail_struct_pattern_missing_comma.carbon:[[@LINE+2]]:21: error: expected `,` or `}` [UnexpectedTokenAfterListElement]
// CHECK:STDERR:
let {.x = x: i32 .y = y: i32} = {};
// --- fail_struct_pattern_missing_pattern.carbon
// CHECK:STDERR: fail_struct_pattern_missing_pattern.carbon:[[@LINE+2]]:11: error: expected pattern [ExpectedPattern]
// CHECK:STDERR:
let {.x = } = {};
// --- fail_struct_pattern_shorthand_missing_identifier.carbon
// CHECK:STDERR: fail_struct_pattern_shorthand_missing_identifier.carbon:[[@LINE+2]]:6: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {:i32} = {};
// --- fail_struct_pattern_shorthand_missing_expression.carbon
// CHECK:STDERR: fail_struct_pattern_shorthand_missing_expression.carbon:[[@LINE+2]]:9: error: expected expression [ExpectedExpr]
// CHECK:STDERR:
let {x: } = {};
// --- fail_struct_pattern_shorthand_missing_comma.carbon
// CHECK:STDERR: fail_struct_pattern_shorthand_missing_comma.carbon:[[@LINE+2]]:13: error: expected `,` or `}` [UnexpectedTokenAfterListElement]
// CHECK:STDERR:
let {x: i32 y: i32} = {};
// --- fail_struct_pattern_missing_equals.carbon
// CHECK:STDERR: fail_struct_pattern_missing_equals.carbon:[[@LINE+2]]:9: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x x:i32} = {};
// --- fail_struct_pattern_token_after_underscore.carbon
// CHECK:STDERR: fail_struct_pattern_token_after_underscore.carbon:[[@LINE+2]]:20: error: unexpected token `,` after `_` in struct pattern, expected `}` [ExpectedCloseAfterUnderscore]
// CHECK:STDERR:
let {.x = x: i32, _,} = {};
// --- fail_struct_pattern_underscore_not_last.carbon
// CHECK:STDERR: fail_struct_pattern_underscore_not_last.carbon:[[@LINE+2]]:6: error: unexpected token `,` after `_` in struct pattern, expected `}` [ExpectedCloseAfterUnderscore]
// CHECK:STDERR:
let{_, .x = x: i32} = {};
// --- fail_struct_pattern_extra_token_end.carbon
// CHECK:STDERR: fail_struct_pattern_extra_token_end.carbon:[[@LINE+2]]:18-20: error: expected `,` or `}` [UnexpectedTokenAfterListElement]
// CHECK:STDERR:
let {.x = x: i32 foo, .y = y: i32} = {};
// --- fail_struct_pattern_extra_token_start.carbon
// CHECK:STDERR: fail_struct_pattern_extra_token_start.carbon:[[@LINE+2]]:23: error: expected `:` or `:?` in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {.x = x: i32, foo .y = y: i32} = {};
// --- fail_struct_pattern_shorthand_extra_token_end.carbon
// CHECK:STDERR: fail_struct_pattern_shorthand_extra_token_end.carbon:[[@LINE+2]]:13-15: error: expected `,` or `}` [UnexpectedTokenAfterListElement]
// CHECK:STDERR:
let {x: i32 foo, y: i32} = {};
// --- fail_struct_pattern_shorthand_extra_token_start.carbon
// CHECK:STDERR: fail_struct_pattern_shorthand_extra_token_start.carbon:[[@LINE+2]]:18: error: expected `:` or `:?` in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {x: i32, foo y: i32} = {};
// --- fail_struct_pattern_invalid_introducer.carbon
// CHECK:STDERR: fail_struct_pattern_invalid_introducer.carbon:[[@LINE+2]]:6: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {!x = x: i32} = {};
// --- fail_struct_pattern_extra_token_middle.carbon
// recover on `=`
// CHECK:STDERR: fail_struct_pattern_extra_token_middle.carbon:[[@LINE+2]]:9-11: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x foo = x: ()} = {};
// no equals or comma - recover on `}`
// CHECK:STDERR: fail_struct_pattern_extra_token_middle.carbon:[[@LINE+2]]:9-11: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x foo x: ()} = {};
// no equals, trailing comma - recover on `,`
// CHECK:STDERR: fail_struct_pattern_extra_token_middle.carbon:[[@LINE+2]]:9-11: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x foo x: (),} = {};
// no equals, second field - recover on `,`
// CHECK:STDERR: fail_struct_pattern_extra_token_middle.carbon:[[@LINE+2]]:9-11: error: expected `= value` after `.field` [ExpectedStructPatternDesignatedField]
// CHECK:STDERR:
let {.x foo x: (), .y = y: ()} = {};
// --- fail_struct_pattern_invalid_field.carbon
// CHECK:STDERR: fail_struct_pattern_invalid_field.carbon:[[@LINE+2]]:6-10: error: expected name in binding pattern [ExpectedBindingPattern]
// CHECK:STDERR:
let {"foo" = , .x = x:()} = {};
// --- fail_struct_pattern_nested_tuple_pattern.carbon
// CHECK:STDERR: fail_struct_pattern_nested_tuple_pattern.carbon:[[@LINE+2]]:14: error: Tuple pattern in shorthand struct pattern field. Use `.field = (...)` instead [NestedTuplePatternInStructPatternShortField]
// CHECK:STDERR:
var {x: i32, (y: i32, z: i32)} = {};
// --- fail_struct_pattern_nested_var_tuple_pattern.carbon
// CHECK:STDERR: fail_struct_pattern_nested_var_tuple_pattern.carbon:[[@LINE+2]]:18: error: Tuple pattern in shorthand struct pattern field. Use `.field = (...)` instead [NestedTuplePatternInStructPatternShortField]
// CHECK:STDERR:
let {x: i32, var (y: i32, z: i32)} = {};
// --- fail_struct_pattern_nested_struct_pattern.carbon
// CHECK:STDERR: fail_struct_pattern_nested_struct_pattern.carbon:[[@LINE+2]]:13: error: Struct pattern in shorthand struct pattern field. Use `.field = {...}` instead [NestedStructPatternStructPatternShortField]
// CHECK:STDERR:
let{x: i32, {y: i32, z: i32}} = {};
// --- fail_struct_pattern_unused_shorthand.carbon
// CHECK:STDERR: fail_struct_pattern_unused_shorthand.carbon:[[@LINE+2]]:7: error: Anonymous binding found in struct pattern. Use `.field = _: field_type` or `unused field: field_type` [AnonymousBindingInStructPattern]
// CHECK:STDERR:
var {_: i32} = {};
// CHECK:STDERR: fail_struct_pattern_unused_shorthand.carbon:[[@LINE+2]]:11: error: Anonymous binding found in struct pattern. Use `.field = _: field_type` or `unused field: field_type` [AnonymousBindingInStructPattern]
// CHECK:STDERR:
let {ref _: i32} = {};
// CHECK:STDERR: fail_struct_pattern_unused_shorthand.carbon:[[@LINE+2]]:11: error: Anonymous binding found in struct pattern. Use `.field = _: field_type` or `unused field: field_type` [AnonymousBindingInStructPattern]
// CHECK:STDERR:
let {var _: i32} = {};
// CHECK:STDOUT: - filename: struct_pattern_empty.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_one_entry.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_trailing_comma.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_two_entries.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'm'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'n'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_value_literal_as_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─IntLiteral '1'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─IntLiteral '2'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_discard.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ ├─UnderscoreName '_'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_unnamed.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─UnderscoreName '_'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_shorthand.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_shorthand_ref.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─RefBindingName 'ref'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_shorthand_mixed.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'm'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_designated_tuple.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'a'
// CHECK:STDOUT: │ │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'b'
// CHECK:STDOUT: │ │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─TuplePattern ')'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_pattern_designated_struct.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'a'
// CHECK:STDOUT: │ │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'b'
// CHECK:STDOUT: │ │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─StructPattern '}'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_comma_only.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature ',' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse ',' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse ',' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern ',' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_missing_designator.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature '=' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '=' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '=' has_error
// CHECK:STDOUT: │ │ │ ╭─LetBindingPattern '=' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ ├─IdentifierNameExpr 'y'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_invalid_designator.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature '7' has_error
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '=' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_designator_only.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '}' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_type_literal_as_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse ':' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_period_only.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature '}' has_error
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '}' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_repeated_comma.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature ',' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse ',' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse ',' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern ',' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_missing_comma.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ │ │ ├─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─MemberAccessExpr '.'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_missing_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '}' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '=' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_shorthand_missing_identifier.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature ':' has_error
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':' has_error
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_shorthand_missing_expression.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '}' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_shorthand_missing_comma.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_missing_equals.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'x' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_token_after_underscore.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ ├─UnderscoreName '_' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_underscore_not_last.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ ├─UnderscoreName '_' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_extra_token_end.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_extra_token_start.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'foo'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '.' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '.' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern 'foo' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_shorthand_extra_token_end.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_shorthand_extra_token_start.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'foo'
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'y' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'y' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern 'foo' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_invalid_introducer.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature '!' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '!' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '!' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern '!' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_extra_token_middle.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '=' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'foo' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'foo' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ ├─InvalidParse 'foo' has_error
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '.' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_invalid_field.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature '"foo"' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '"foo"' has_error
// CHECK:STDOUT: │ │ │ ├─InvalidParse '"foo"' has_error
// CHECK:STDOUT: │ │ ├─LetBindingPattern '"foo"' has_error
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_nested_tuple_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'z'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─TuplePattern ')'
// CHECK:STDOUT: │ │ ╭─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─VariableDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_nested_var_tuple_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'z'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ╭─TuplePattern ')'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_nested_struct_pattern.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'z'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_struct_pattern_unused_shorthand.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─UnderscoreName '_'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':' has_error
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─VarBindingPattern ':' has_error
// CHECK:STDOUT: │ │ ╭─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─VariableDecl ';'
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─UnderscoreName '_'
// CHECK:STDOUT: │ │ │ ╭─RefBindingName 'ref' has_error
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':' has_error
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─UnderscoreName '_'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':' has_error
// CHECK:STDOUT: │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':' has_error
// CHECK:STDOUT: │ │ ├─VariablePattern 'var' has_error
// CHECK:STDOUT: │ ├─StructPattern '}' has_error
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
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