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Add support for _ binding patterns (#5097)

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Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Geoff Romer
2025-03-17 22:29:56 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent d8d2da4ea0
commit a584ee120e
15 changed files with 423 additions and 45 deletions
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toolchain/parse/testdata/let/let.carbon
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+17 -1
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@@ -9,8 +9,10 @@
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/let/let.carbon
let v: i32 = 0;
let _: i32 = 1;
fn F() {
let s: String = "hello";
let _: i32 = "goodbye";
}
// CHECK:STDOUT: - filename: let.carbon
@@ -23,6 +25,13 @@ fn F() {
// CHECK:STDOUT: {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '0'},
// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT: {kind: 'UnderscoreName', text: '_'},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'LetBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '1'},
// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'F'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
@@ -35,6 +44,13 @@ fn F() {
// CHECK:STDOUT: {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT: {kind: 'StringLiteral', text: '"hello"'},
// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 13},
// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT: {kind: 'UnderscoreName', text: '_'},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'LetBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT: {kind: 'StringLiteral', text: '"goodbye"'},
// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 20},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]