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carbon-lang/toolchain/check/testdata/match_first/basic.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

565 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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
// ^ARGS: -v compile %s
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/match_first/basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/match_first/basic.carbon
// --- empty.carbon
library "[[@TEST_NAME]]";
match_first {}
// --- todo_fail_class_inside.carbon
library "[[@TEST_NAME]]";
match_first {
// TODO: Only impls are allowed inside match_first.
class C;
}
// --- todo_fail_interface_inside.carbon
library "[[@TEST_NAME]]";
match_first {
// TODO: Only impls are allowed inside match_first.
interface Z;
}
// --- todo_fail_constraint_inside.carbon
library "[[@TEST_NAME]]";
match_first {
// TODO: Only impls are allowed inside match_first.
constraint N;
}
// --- todo_fail_function_inside.carbon
library "[[@TEST_NAME]]";
match_first {
// TODO: Only impls are allowed inside match_first.
fn F();
}
// --- fail_final_inside.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
// CHECK:STDERR: fail_final_inside.carbon:[[@LINE+3]]:3-22: error: `final impl` in `match_first` block [FinalImplInMatchFirst]
// CHECK:STDERR: fail_final_inside.carbon:[[@LINE-2]]:1-13: note: the `match_first` block can be modified as `final` instead [FinalImplInMatchFirstNote]
// CHECK:STDERR:
final impl () as Z {}
}
// --- fail_final_redecl.carbon
library "[[@TEST_NAME]]";
interface Z {}
// CHECK:STDERR: fail_final_redecl.carbon:[[@LINE+2]]:1-19: error: impl declared but not defined [ImplMissingDefinition]
// CHECK:STDERR:
final impl () as Z;
match_first {
// This is not seen as a redecl of the `final impl`. It's not valid to write
// an `impl` in `match_first` that overlaps a `final impl`, but we already
// have a diagnostic.
impl () as Z {}
}
// --- fail_final_redecl_defined_once.carbon
library "[[@TEST_NAME]]";
interface Z {}
final impl () as Z {}
match_first {
// This is not seen as a redecl of the `final impl`. It's not valid to write
// an `impl` in `match_first` that overlaps a `final impl`, but we already
// have a diagnostic.
// CHECK:STDERR: fail_final_redecl_defined_once.carbon:[[@LINE+2]]:3-15: error: impl declared but not defined [ImplMissingDefinition]
// CHECK:STDERR:
impl () as Z;
}
// --- fail_final_redecl_defined_twice.carbon
library "[[@TEST_NAME]]";
interface Z {}
final impl () as Z {}
match_first {
// This is not seen as a redecl of the `final impl`. It's not valid to write
// an `impl` in `match_first` that overlaps a `final impl`, but we already
// have a diagnostic.
// CHECK:STDERR: fail_final_redecl_defined_twice.carbon:[[@LINE+3]]:3-16: error: `impl` will never be used [ImplFinalOverlapsNonFinal]
// CHECK:STDERR: fail_final_redecl_defined_twice.carbon:[[@LINE-6]]:1-20: note: `final impl` declared here would always be used instead [ImplFinalOverlapsNonFinalNote]
// CHECK:STDERR:
impl () as Z {}
}
// --- fail_final_final_redecl.carbon
library "[[@TEST_NAME]]";
interface Z {}
final impl () as Z;
match_first {
// This _is_ seen as a redecl of the `final impl`. It's not valid to write
// an `impl` in `match_first` that overlaps a `final impl`, but we already
// have a diagnostic.
// CHECK:STDERR: fail_final_final_redecl.carbon:[[@LINE+3]]:3-22: error: `final impl` in `match_first` block [FinalImplInMatchFirst]
// CHECK:STDERR: fail_final_final_redecl.carbon:[[@LINE-5]]:1-13: note: the `match_first` block can be modified as `final` instead [FinalImplInMatchFirstNote]
// CHECK:STDERR:
final impl () as Z {}
}
// --- decl.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z;
}
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
// --- definition.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
}
// --- redecl_defined.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z;
match_first {
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
}
// --- redecl.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z;
match_first {
impl () as Z;
}
impl () as Z {}
// --- redecl_after_defined.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z {}
match_first {
impl () as Z;
}
// --- fail_redecl_with_definition_after_defined.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z {}
match_first {
// CHECK:STDERR: fail_redecl_with_definition_after_defined.carbon:[[@LINE+3]]:3-16: error: redefinition of `impl () as Z` [ImplRedefinition]
// CHECK:STDERR: fail_redecl_with_definition_after_defined.carbon:[[@LINE-3]]:1-14: note: previous definition was here [ImplPreviousDefinition]
// CHECK:STDERR:
impl () as Z {}
}
// --- inside_class.carbon
library "[[@TEST_NAME]]";
interface Z {}
class C {
match_first {
impl Self as Z {}
}
}
// --- inside_function.carbon
library "[[@TEST_NAME]]";
interface Z {}
fn F() {
match_first {
impl () as Z {}
}
}
// --- fail_inside_interface.carbon
library "[[@TEST_NAME]]";
interface Z {}
interface Y {
// CHECK:STDERR: fail_inside_interface.carbon:[[@LINE+3]]:3-15: error: found `match_first` in invalid scope; expected namespace or class [MatchFirstInWrongScope]
// CHECK:STDERR: fail_inside_interface.carbon:[[@LINE-2]]:1-13: note: in enclosing scope here [MatchFirstInWrongScopeNote]
// CHECK:STDERR:
match_first {
impl Self as Z {}
}
}
// --- fail_inside_constraint.carbon
library "[[@TEST_NAME]]";
interface Z {}
constraint N {
// CHECK:STDERR: fail_inside_constraint.carbon:[[@LINE+3]]:3-15: error: found `match_first` in invalid scope; expected namespace or class [MatchFirstInWrongScope]
// CHECK:STDERR: fail_inside_constraint.carbon:[[@LINE-2]]:1-14: note: in enclosing scope here [MatchFirstInWrongScopeNote]
// CHECK:STDERR:
match_first {
impl Self as Z {}
}
}
// --- fail_inside_match_first.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
// CHECK:STDERR: fail_inside_match_first.carbon:[[@LINE+3]]:3-15: error: found `match_first` in invalid scope; expected namespace or class [MatchFirstInWrongScope]
// CHECK:STDERR: fail_inside_match_first.carbon: note: in enclosing scope here [MatchFirstInWrongScopeNote]
// CHECK:STDERR:
match_first {
impl () as Z {}
}
}
// --- fail_redecl_in_same_block.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z;
// CHECK:STDERR: fail_redecl_in_same_block.carbon:[[@LINE+3]]:3-15: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_redecl_in_same_block.carbon:[[@LINE-2]]:3-15: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z;
}
impl () as Z {}
// --- fail_defined_in_same_block.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z;
// CHECK:STDERR: fail_defined_in_same_block.carbon:[[@LINE+3]]:3-16: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_defined_in_same_block.carbon:[[@LINE-2]]:3-15: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z {}
}
// --- fail_redecl_after_defined_in_same_block.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z {}
// CHECK:STDERR: fail_redecl_after_defined_in_same_block.carbon:[[@LINE+3]]:3-15: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_redecl_after_defined_in_same_block.carbon:[[@LINE-2]]:3-16: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z;
}
// --- fail_two_redecl_in_same_block.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z {}
match_first {
impl () as Z;
// TODO: This "previous declaration" location is wrong. The redecl came after.
// CHECK:STDERR: fail_two_redecl_in_same_block.carbon:[[@LINE+3]]:3-15: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_two_redecl_in_same_block.carbon:[[@LINE-3]]:3-15: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z;
}
// --- fail_redecl_in_different_block.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z;
}
match_first {
// CHECK:STDERR: fail_redecl_in_different_block.carbon:[[@LINE+3]]:3-15: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_redecl_in_different_block.carbon:[[@LINE-4]]:3-15: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z;
}
impl () as Z {}
// --- fail_redecl_defined_in_different_block_firset.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z {}
}
match_first {
// CHECK:STDERR: fail_redecl_defined_in_different_block_firset.carbon:[[@LINE+3]]:3-15: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_redecl_defined_in_different_block_firset.carbon:[[@LINE-4]]:3-16: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z;
}
// --- fail_redecl_defined_in_different_block_second.carbon
library "[[@TEST_NAME]]";
interface Z {}
match_first {
impl () as Z;
}
match_first {
// CHECK:STDERR: fail_redecl_defined_in_different_block_second.carbon:[[@LINE+3]]:3-16: error: impl declared in `match_first` more than once [ImplInTwoMatchFirst]
// CHECK:STDERR: fail_redecl_defined_in_different_block_second.carbon:[[@LINE-4]]:3-15: note: previous declaration here [ImplInTwoMatchFirstNote]
// CHECK:STDERR:
impl () as Z {}
}
// --- final_block_redecl.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z;
final match_first {
impl () as Z;
}
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
// --- final_block_decl.carbon
library "[[@TEST_NAME]]";
interface Z {}
final match_first {
impl () as Z;
}
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
// --- final_block_defined.carbon
library "[[@TEST_NAME]]";
interface Z {}
impl () as Z;
final match_first {
//@dump-sem-ir-begin
impl () as Z {}
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- decl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc9_7.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc9_7.2: type = converted %.loc9_7.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref.loc9: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc9: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc9_7.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc6_9.2 as %Z.ref.loc6 {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref.loc6
// CHECK:STDOUT: match_first = position 0
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: %Z.impl_witness: <witness> = impl_witness @empty_tuple.type.as.Z.impl.%Z.impl_witness_table [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc7_9.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc7_9.2: type = converted %.loc7_9.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc7: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc7_9.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc7_9.2 as %Z.ref {
// CHECK:STDOUT: %Z.impl_witness_table = impl_witness_table (), @empty_tuple.type.as.Z.impl [concrete]
// CHECK:STDOUT: %Z.impl_witness: <witness> = impl_witness %Z.impl_witness_table [concrete = constants.%Z.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref
// CHECK:STDOUT: match_first = position 0
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- redecl_defined.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc8_9.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_9.2: type = converted %.loc8_9.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref.loc8: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc8_9.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc5_7.2 as %Z.ref.loc5 {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref.loc5
// CHECK:STDOUT: match_first = position 0
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- final_block_redecl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc10_7.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc10_7.2: type = converted %.loc10_7.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref.loc10: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc10: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc10_7.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc5_7.2 as %Z.ref.loc5 {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref.loc5
// CHECK:STDOUT: match_first = position 0, final
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- final_block_decl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc9_7.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc9_7.2: type = converted %.loc9_7.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref.loc9: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc9: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc9_7.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc6_9.2 as %Z.ref.loc6 {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref.loc6
// CHECK:STDOUT: match_first = position 0, final
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- final_block_defined.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.78e: <witness> = impl_self_witness %empty_tuple.type, @Z [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @empty_tuple.type.as.Z.impl [concrete] {} {
// CHECK:STDOUT: %.loc8_9.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_9.2: type = converted %.loc8_9.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %Z.ref.loc8: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8: <witness> = impl_self_witness @empty_tuple.type.as.Z.impl.%.loc8_9.2, @Z [concrete = constants.%.78e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @empty_tuple.type.as.Z.impl: %.loc5_7.2 as %Z.ref.loc5 {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %Z.ref.loc5
// CHECK:STDOUT: match_first = position 0, final
// CHECK:STDOUT: witness = %Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
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