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carbon-lang/toolchain/parse/testdata/var/var_pattern.carbon
T
Geoff Romer 6429c1655c Make the tree structure more explicit in parse dumps (#7591) 
It's hard to track 2-space indent levels across large vertical gaps, and
it can be hard to suppress the instinct to read the dump as if it were
preorder. This change introduces a new dump mode that addresses both
problems by using box-drawing characters to explicitly represent the
parent-child edges of the tree. This new mode is the default, but the
old behavior remains available with
`--parse-dump-format=yaml-postorder`.
2026-07-31 16:44:18 +00:00

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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/var/var_pattern.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/var/var_pattern.carbon
// --- basic.carbon
let var x: () = ();
// --- tuple.carbon
let (x: (), var y: ()) = ((), ());
// --- function.carbon
fn F(x: (), var y: ());
// --- struct.carbon
let {.x = var x: ()} = {.x = ()};
// --- struct_shorthand.carbon
let {var y: ()} = {.y = ()};
// --- fail_nested.carbon
// CHECK:STDERR: fail_nested.carbon:[[@LINE+4]]:25: error: `var` nested within another `var` [NestedVar]
// CHECK:STDERR: let (x: (), var (y: (), var z: ())) = ((), ((), ()));
// CHECK:STDERR: ^~~
// CHECK:STDERR:
let (x: (), var (y: (), var z: ())) = ((), ((), ()));
// CHECK:STDOUT: - filename: basic.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ ├─TupleLiteral ')'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: tuple.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─TuplePattern ')'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─TupleLiteralComma ','
// CHECK:STDOUT: │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ ├─TupleLiteral ')'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: function.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'F'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─ExplicitParamList ')'
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct.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: │ │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ │ ├─StructPatternDesignatedField '='
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─StructLiteralField '='
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: struct_shorthand.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─StructPatternStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─StructPattern '}'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ ╭─StructFieldDesignator '.'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─StructLiteralField '='
// CHECK:STDOUT: │ ├─StructLiteral '}'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_nested.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─LetIntroducer 'let'
// CHECK:STDOUT: │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ ╭─TuplePatternStart '('
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'y'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─PatternListComma ','
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'z'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ │ ├─VariablePattern 'var' has_error
// CHECK:STDOUT: │ │ │ ╭─TuplePattern ')' has_error
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─TuplePattern ')'
// CHECK:STDOUT: │ ├─LetInitializer '='
// CHECK:STDOUT: │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─TupleLiteralComma ','
// CHECK:STDOUT: │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─TupleLiteralComma ','
// CHECK:STDOUT: │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ ├─TupleLiteral ')'
// CHECK:STDOUT: ├─LetDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
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