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carbon-lang/toolchain/parse/testdata/where_expr/impl_where.carbon
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Dana JansensandJon Ross-Perkins 4b0e2b03b6 Add the .Self name for the type expression of a compile time binding (#5937) 
We add a virtual node (`CompileTimeBindingPatternStart`) as the first
child of `CompileTimeBindingPattern` which holds the identifier
underneath it, so that it is checked just before the type expression of
the `CompileTimeBindingPattern`. When we reach this virtual node during
check, we add `.Self` as a name in the current scope, and when we reach
`CompileTimeBindingPattern` we remove it from scope, which ensures it's
present during only the checking of the type expression for the compile
time pattern.

At the moment the `.Self` has a different type (it's a `TypeType`) than
other `.Self` in the facet type (which are a single `FacetType`), but
the intention is to immediately substitute it out of the facet type
entirely, replacing it with a reference to the compile time binding (a
`BindSymbolicName`) itself. A TODO has been added for this.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-08-12 16:27:07 +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/where_expr/impl_where.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/where_expr/impl_where.carbon
interface Interface {
let T:! type;
}
impl i32 as Interface where .T = () {
}
impl bool as Interface where .T = i32;
impl () as (Interface where .T = {}) {}
impl {} as (Interface where .T = ()) where .T = ();
impl f64 as Interface where .T = (type where .Self impls type) {
}
// CHECK:STDOUT: - filename: impl_where.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'InterfaceIntroducer', text: 'interface'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'Interface'},
// CHECK:STDOUT: {kind: 'InterfaceDefinitionStart', text: '{', subtree_size: 3},
// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', subtree_size: 4},
// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'InterfaceDefinition', text: '}', subtree_size: 10},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'TypeImplAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 5},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 8},
// CHECK:STDOUT: {kind: 'ImplDefinitionStart', text: '{', subtree_size: 12},
// CHECK:STDOUT: {kind: 'ImplDefinition', text: '}', subtree_size: 13},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'BoolTypeLiteral', text: 'bool'},
// CHECK:STDOUT: {kind: 'TypeImplAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 4},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 7},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', subtree_size: 11},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TypeImplAs', text: 'as', subtree_size: 3},
// CHECK:STDOUT: {kind: 'ParenExprStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'StructLiteralStart', text: '{'},
// CHECK:STDOUT: {kind: 'StructLiteral', text: '}', subtree_size: 2},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 5},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 8},
// CHECK:STDOUT: {kind: 'ParenExpr', text: ')', subtree_size: 10},
// CHECK:STDOUT: {kind: 'ImplDefinitionStart', text: '{', subtree_size: 15},
// CHECK:STDOUT: {kind: 'ImplDefinition', text: '}', subtree_size: 16},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'StructLiteralStart', text: '{'},
// CHECK:STDOUT: {kind: 'StructLiteral', text: '}', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TypeImplAs', text: 'as', subtree_size: 3},
// CHECK:STDOUT: {kind: 'ParenExprStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 5},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 8},
// CHECK:STDOUT: {kind: 'ParenExpr', text: ')', subtree_size: 10},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 11},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 5},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 17},
// CHECK:STDOUT: {kind: 'ImplDecl', text: ';', subtree_size: 22},
// CHECK:STDOUT: {kind: 'ImplIntroducer', text: 'impl'},
// CHECK:STDOUT: {kind: 'FloatTypeLiteral', text: 'f64'},
// CHECK:STDOUT: {kind: 'TypeImplAs', text: 'as', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Interface'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ParenExprStart', text: '('},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'SelfTypeName', text: 'Self'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'RequirementImpls', text: 'impls', subtree_size: 4},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 7},
// CHECK:STDOUT: {kind: 'ParenExpr', text: ')', subtree_size: 9},
// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 12},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 15},
// CHECK:STDOUT: {kind: 'ImplDefinitionStart', text: '{', subtree_size: 19},
// CHECK:STDOUT: {kind: 'ImplDefinition', text: '}', subtree_size: 20},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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