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Fix parse support for 'fn F[];' (#5135)

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According to approved syntax at
https://github.com/carbon-language/carbon-lang/blob/trunk/proposals/p3848.md#syntax-defined,
`fn F[]` without explicit parameters should be valid. This makes it
work, then adds some validation to prevent `class C[]` in check.

Note that for `fn`, positional parameters are a TODO -- but this allows
me to test validation in `fn destroy[]` which is rejected, not just a
TODO.
This commit is contained in:
Jon Ross-Perkins
2025-03-18 00:31:17 +00:00
committed by GitHub
parent a584ee120e
commit 8738497301
15 changed files with 402 additions and 93 deletions
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toolchain/check/testdata/function/definition/no_prelude/syntactic_merge.carbon
Vendored
+62
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@@ -46,6 +46,31 @@ fn Foo(a: C);
// CHECK:STDERR:
fn Foo(a: (C)) {}
// --- fail_only_implicit_params.carbon
library "[[@TEST_NAME]]";
class C {}
// CHECK:STDERR: fail_only_implicit_params.carbon:[[@LINE+8]]:8: error: implicit parameters of functions must be constant or `self` [ImplictParamMustBeConstant]
// CHECK:STDERR: fn Foo[a: C];
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_only_implicit_params.carbon:[[@LINE+4]]:1: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR: fn Foo[a: C];
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
fn Foo[a: C];
// CHECK:STDERR: fail_only_implicit_params.carbon:[[@LINE+8]]:8: error: implicit parameters of functions must be constant or `self` [ImplictParamMustBeConstant]
// CHECK:STDERR: fn Foo[a: (C)] {}
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_only_implicit_params.carbon:[[@LINE+4]]:1: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR: fn Foo[a: (C)] {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn Foo[a: (C)] {}
// --- todo_fail_raw_identifier.carbon
library "[[@TEST_NAME]]";
@@ -341,6 +366,43 @@ fn Foo(a: const (const C)) {}
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_only_implicit_params.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Foo.type.a02530.1: type = fn_type @Foo.1 [concrete]
// CHECK:STDOUT: %Foo.ddeb7d.1: %Foo.type.a02530.1 = struct_value () [concrete]
// CHECK:STDOUT: %Foo.type.a02530.2: type = fn_type @Foo.2 [concrete]
// CHECK:STDOUT: %Foo.ddeb7d.2: %Foo.type.a02530.2 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .Foo = %Foo.decl.loc14
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %Foo.decl.loc14: %Foo.type.a02530.1 = fn_decl @Foo.1 [concrete = constants.%Foo.ddeb7d.1] {} {}
// CHECK:STDOUT: %Foo.decl.loc23: %Foo.type.a02530.2 = fn_decl @Foo.2 [concrete = constants.%Foo.ddeb7d.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Foo.1[<error>: <error>]();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Foo.2[<error>: <error>]() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- todo_fail_raw_identifier.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {