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carbon-lang/toolchain/check/testdata/packages/fail_export_name_params.carbon
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Chandler Carruth 8be274cf60 Replace :! binding syntax with phase keywords and contextual defaults (#7479) 
Implement the toolchain side of proposal #7254, removing the `:!`
binding
syntax for generic and template parameters in favor of the keywords
`generic`,
`template`, and `runtime` plus contextual defaults for phase.

For valid programs this is semantics-preserving: each binding resolves
to the
same phase, and produces the same SemIR, as it did under `:!`/`:`. The
parser
derives a binding's phase from its syntactic context plus any explicit
phase
keyword; new diagnostics and error recovery for misused keywords are
described
below.

Implementation details for each component:

- Lexer: remove the `:!` (`ColonExclaim`) token, move its virtual
parse-node
  budget onto `:`, and add the `generic` and `runtime` keywords.
- Parser: thread a `BindingContext` (`ExplicitParam`, `DeducedParam`, or
`CompileTimeEntityParam`) from declaration introducers down through
parameter
lists to each binding pattern, using a one-token lookahead to
distinguish a
name-qualifier parameter list from a declaration's own final list.
Parameters
of a compile-time entity (`class`, `interface`, `constraint`, `choice`,
`alias`, `export`, `namespace`) and deduced `[]` parameters default to
checked
generic; explicit function parameters and local bindings default to
runtime.
`HandleBindingPattern` resolves the phase from that context plus the
keyword: a
`generic` keyword needs no node of its own (the phase is carried by the
  binding's node kind), while a `runtime` keyword is preserved as a
`RuntimeBindingName` node so `check` can name it in a diagnostic. A
phase
keyword that is merely redundant with the contextual default is
diagnosed
  here, without invalidating the parse tree.
- Check: a phase keyword that is invalid for its context (for example
`runtime`
on a checked-generic parameter) is diagnosed here, and recovers by
building an
error binding that still introduces the name so that later uses of it do
not
  produce cascading errors.

The removed `:!` syntax is now rejected as an ordinary parse error.

The `form`/`:?`/`->?` ("extended types") portion of proposal #7254 is
left for a
separate change.

Assisted-by: Claude Code
2026-07-11 01:22:44 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/packages/fail_export_name_params.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/packages/fail_export_name_params.carbon
// --- a.carbon
package Foo library "[[@TEST_NAME]]";
class C1(T: type);
class C2(T: type);
// --- fail_b.carbon
package Foo library "[[@TEST_NAME]]";
import library "a";
export C1;
// CHECK:STDERR: fail_b.carbon:[[@LINE+4]]:10: error: `export` declaration cannot have parameters [UnexpectedDeclNameParams]
// CHECK:STDERR: export C2(T: type);
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
export C2(T: type);
// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %C1.type: type = generic_class_type @C1 [concrete]
// CHECK:STDOUT: %C1.generic: %C1.type = struct_value () [concrete]
// CHECK:STDOUT: %C2.type: type = generic_class_type @C2 [concrete]
// CHECK:STDOUT: %C2.generic: %C2.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C1 = %C1.decl
// CHECK:STDOUT: .C2 = %C2.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %C1.decl: %C1.type = class_decl @C1 [concrete = constants.%C1.generic] {
// CHECK:STDOUT: %T.patt.loc4_11.1: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc4_11.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc4_13.1: type = splice_block %.loc4_13.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc4_13.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc4_11.2: type = symbolic_binding T, 0 [symbolic = %T.loc4_11.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %C2.decl: %C2.type = class_decl @C2 [concrete = constants.%C2.generic] {
// CHECK:STDOUT: %T.patt.loc5_11.1: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc5_11.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc5_13.1: type = splice_block %.loc5_13.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc5_13.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc5_11.2: type = symbolic_binding T, 0 [symbolic = %T.loc5_11.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @C1(%T.loc4_11.2: type) {
// CHECK:STDOUT: %T.patt.loc4_11.2: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc4_11.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc4_11.1: type = symbolic_binding T, 0 [symbolic = %T.loc4_11.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: class;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @C2(%T.loc5_11.2: type) {
// CHECK:STDOUT: %T.patt.loc5_11.2: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc5_11.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc5_11.1: type = symbolic_binding T, 0 [symbolic = %T.loc5_11.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: class;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C1(constants.%T) {
// CHECK:STDOUT: %T.patt.loc4_11.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc4_11.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C2(constants.%T) {
// CHECK:STDOUT: %T.patt.loc5_11.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc5_11.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C1.type: type = generic_class_type @C1 [concrete]
// CHECK:STDOUT: %C1.generic: %C1.type = struct_value () [concrete]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %C2.type: type = generic_class_type @C2 [concrete]
// CHECK:STDOUT: %C2.generic: %C2.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Foo.C1: %C1.type = import_ref Foo//a, C1, loaded [concrete = constants.%C1.generic]
// CHECK:STDOUT: %Foo.C2: %C2.type = import_ref Foo//a, C2, loaded [concrete = constants.%C2.generic]
// CHECK:STDOUT: %Foo.import_ref.b3bc94.1: type = import_ref Foo//a, loc4_11, loaded [symbolic = @C1.%T (constants.%T)]
// CHECK:STDOUT: %Foo.import_ref.b3bc94.2: type = import_ref Foo//a, loc5_11, loaded [symbolic = @C2.%T (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C1 = %C1
// CHECK:STDOUT: .C2 = %C2
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %C1: %C1.type = export C1, imports.%Foo.C1 [concrete = constants.%C1.generic]
// CHECK:STDOUT: %.loc12_14.1: type = splice_block %.loc12_14.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc12_14.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic = constants.%T]
// CHECK:STDOUT: %C2: %C2.type = export C2, imports.%Foo.C2 [concrete = constants.%C2.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @C1(imports.%Foo.import_ref.b3bc94.1: type) [from "a.carbon"] {
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt (constants.%T.patt)]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic = %T (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: class;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @C2(imports.%Foo.import_ref.b3bc94.2: type) [from "a.carbon"] {
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [symbolic = %T.patt (constants.%T.patt)]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic = %T (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: class;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C1(constants.%T) {
// CHECK:STDOUT: %T.patt => constants.%T.patt
// CHECK:STDOUT: %T => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C2(constants.%T) {
// CHECK:STDOUT: %T.patt => constants.%T.patt
// CHECK:STDOUT: %T => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
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