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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/declaration/no_prelude/fail_todo_no_params.carbon
Vendored
+34
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@@ -36,6 +36,15 @@ library "[[@TEST_NAME]]";
// CHECK:STDERR:
fn A -> ();
// --- fail_todo_implicit_only.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_implicit_only.carbon:[[@LINE+4]]:1: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR: fn A[] -> ();
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
fn A[] -> ();
// --- fail_todo_arrow_body.carbon
// TODO: We don't have parsing support for this yet.
@@ -128,6 +137,31 @@ fn A {
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() -> %empty_tuple.type;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_implicit_only.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {
// CHECK:STDOUT: %return.patt: %empty_tuple.type = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %empty_tuple.type = out_param_pattern %return.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc7_12.1: %empty_tuple.type = tuple_literal ()
// CHECK:STDOUT: %.loc7_12.2: type = converted %.loc7_12.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param0
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A[]() -> %empty_tuple.type;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_arrow_body.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {}