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Replace impl fn with override fn (#6008)

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This proposal renames the syntax used to mark an overriding definition
of a virtual method from `impl fn` to `override fn` to avoid ambiguity:
besides indicating an overriding virtual function, it can be parsed as
an "impl" declaration when the construct following "impl" begins with a
lambda introduced by "fn".

Closes #5711

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Elliott Kalt
2025-09-12 23:27:02 +00:00
committed by GitHub
co-authored by Richard Smith
parent 973d721916
commit f4bd6e42f9
17 changed files with 234 additions and 162 deletions
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toolchain/parse/testdata/function/declaration.carbon
Vendored
+8 -8
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@@ -58,10 +58,10 @@ fn destroy[self: Self]().Foo() {}
// --- impl_fn.carbon
impl fn F();
abstract impl fn G();
impl abstract fn H();
private impl default fn I();
override fn F();
abstract override fn G();
override abstract fn H();
private override default fn I();
// --- fail_identifier_instead_of_sig.carbon
@@ -346,20 +346,20 @@ 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);
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'ImplModifier', text: 'impl'},
// CHECK:STDOUT: {kind: 'OverrideModifier', text: 'override'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'F'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'AbstractModifier', text: 'abstract'},
// CHECK:STDOUT: {kind: 'ImplModifier', text: 'impl'},
// CHECK:STDOUT: {kind: 'OverrideModifier', text: 'override'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'ImplModifier', text: 'impl'},
// CHECK:STDOUT: {kind: 'OverrideModifier', text: 'override'},
// CHECK:STDOUT: {kind: 'AbstractModifier', text: 'abstract'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'H'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
@@ -367,7 +367,7 @@ 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);
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'PrivateModifier', text: 'private'},
// CHECK:STDOUT: {kind: 'ImplModifier', text: 'impl'},
// CHECK:STDOUT: {kind: 'OverrideModifier', text: 'override'},
// CHECK:STDOUT: {kind: 'DefaultModifier', text: 'default'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'I'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},