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Check support for form literals and :? bindings (#6747)

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Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This commit is contained in:
Geoff Romer
2026-02-26 23:01:24 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins Carbon Infra Bot
parent f9ab963bd6
commit bf9219d30e
33 changed files with 1115 additions and 313 deletions
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toolchain/parse/testdata/function/declaration.carbon
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+22
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@@ -167,6 +167,14 @@ fn (a tokens c d e f g h i j k l m n o p q r s t u v w x y z);
fn FormParam(x:? Form);
fn ComplexFormParam(x:? X.Y(Z));
// --- fail_ref_on_form_parameter.carbon
// CHECK:STDERR: fail_ref_on_form_parameter.carbon:[[@LINE+4]]:6: error: expected `:` binding after `ref` [ExpectedRuntimeBindingPatternAfterRef]
// CHECK:STDERR: fn F(ref x:? Form);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
fn F(ref x:? Form);
// --- return_form.carbon
fn SimpleReturnForm() ->? Form;
@@ -457,6 +465,20 @@ fn ComplexReturnForm() ->? X.Y(Z);
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 13},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_ref_on_form_parameter.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'F'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'x'},
// CHECK:STDOUT: {kind: 'RefBindingName', text: 'ref', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Form'},
// CHECK:STDOUT: {kind: 'FormBindingPattern', text: ':?', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 9},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: return_form.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},