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carbon-lang/toolchain/parse/testdata/generics/impl/fail_impl.carbon
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Dana Jansens d2ac9b3933 Diagnose where in a binding that introduces a .Self that does not refer to the binding (#7517) 
This is in addition to finding a `where` on the RHS of another `where`.
Since a generic binding introduces `.Self`, any `where` expression that
isn't part of a facet type modifying the binding itself would introduce
an ambiguous `.Self`.

Add virtual parse nodes for let, var, and form bindings, which goes
before the type. This allows us to track if `where` appears in the
binding's type. We only need to look for an invalid `where` if any
appeared in the type. We combine these three nodes together into a
single node kind, which requires us to remove the name from it as a
child. We move it up to the Pattern node again, and rename the
PatternStart nodes to PatternTypeStart as they are now located in the
middle of the Pattern nodes, just before the type.

And we only need to thaw `.Self` in generic bindings. Non-generic
bindings can only have `.Self` through a `where` expression, since the
name is not provided otherwise to non-generic bindings. And `where`
expressions thaw their `.Self` independently. So the binding only needs
to thaw a `.Self` that it introduced, which is only for generic
bindings.
2026-07-22 16:45:00 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/generics/impl/fail_impl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/generics/impl/fail_impl.carbon
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:10: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl foo bar;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
impl foo bar;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:12: error: expected expression [ExpectedExpr]
// CHECK:STDERR: impl i32 as;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl i32 as;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:18: error: `impl` declarations must either end with a `;` or have a `{ ... }` block for a definition [ExpectedDeclSemiOrDefinition]
// CHECK:STDERR: impl bool as bar unexpected;
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
impl bool as bar unexpected;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:6: error: expected expression [ExpectedExpr]
// CHECK:STDERR: impl return as A;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
impl return as A;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:6: error: expected expression [ExpectedExpr]
// CHECK:STDERR: impl return B;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
impl return B;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+8]]:13: error: expected `[` after `forall` in `impl` declaration [ImplExpectedAfterForall]
// CHECK:STDERR: impl forall f32;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:16: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl forall f32;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl forall f32;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:19: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl forall [] u32;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl forall [] u32;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:25: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl forall [invalid] i8;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl forall [invalid] i8;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:13: error: expected `[` after `forall` in `impl` declaration [ImplExpectedAfterForall]
// CHECK:STDERR: impl forall f16 as Quux;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
impl forall f16 as Quux;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:26: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl forall [T: type] str;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl forall [T: type] str;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:25: error: expected `as` in `impl` declaration [ImplExpectedAs]
// CHECK:STDERR: impl forall [T: type] T missing_as;
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
impl forall [T: type] T missing_as;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:38: error: `impl` declarations must either end with a `;` or have a `{ ... }` block for a definition [ExpectedDeclSemiOrDefinition]
// CHECK:STDERR: impl forall [T: type] T as Interface extra;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
impl forall [T: type] T as Interface extra;
// CHECK:STDERR: fail_impl.carbon:[[@LINE+4]]:5: error: expected expression [ExpectedExpr]
// CHECK:STDERR: impl;
// CHECK:STDERR: ^
// CHECK:STDERR:
impl;
impl
// CHECK:STDERR: fail_impl.carbon:[[@LINE+90]]:21: error: expected expression [ExpectedExpr]
// CHECK:STDERR: // CHECK:STDOUT: ]
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDOUT: - filename: fail_impl.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'foo'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'ImplTypeAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'InvalidParse', text: ';', has_error: yes},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'BoolTypeLiteral', text: 'bool'},
// CHECK:STDOUT: {kind: 'ImplTypeAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'bar'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'return', has_error: yes},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'return', has_error: yes},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'f32', has_error: yes},
// CHECK:STDOUT: {kind: 'FloatTypeLiteral', text: 'f32'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 2},
// CHECK:STDOUT: {kind: 'UnsignedIntTypeLiteral', text: 'u32'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 6},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'invalid'},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 3},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i8'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 7},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'f16', has_error: yes},
// CHECK:STDOUT: {kind: 'FloatTypeLiteral', text: 'f16'},
// CHECK:STDOUT: {kind: 'ImplTypeAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Quux'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 7},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'T'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternTypeStart', text: ':'},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':', subtree_size: 4},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 6},
// CHECK:STDOUT: {kind: 'StringTypeLiteral', text: 'str'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'T'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternTypeStart', text: ':'},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':', subtree_size: 4},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 6},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'T'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'Forall', text: 'forall'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'T'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternTypeStart', text: ':'},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':', subtree_size: 4},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 6},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'T'},
// CHECK:STDOUT: {kind: 'ImplTypeAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 12},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: ';', has_error: yes},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'InvalidParse', text: '', has_error: yes},
// CHECK:STDOUT: {kind: 'ImplDecl', text: 'impl', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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