mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 18:50:10 +01:00
Dana JansensandJon Ross-Perkins
4b0e2b03b6
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>
90 lines
5.7 KiB
Plaintext
90 lines
5.7 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/where_expr/basic.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/where_expr/basic.carbon
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fn Foo(T: type where .Self == i32);
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interface I {
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let T:! type where .Foo impls Bar;
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}
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let T:! type where .U = .V;
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fn F() {
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let U:! type where .W == .X;
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}
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// CHECK:STDOUT: - filename: basic.carbon
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// CHECK:STDOUT: parse_tree: [
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// CHECK:STDOUT: {kind: 'FileStart', text: ''},
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// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
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// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'Foo'},
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// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
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// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
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// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'SelfTypeName', text: 'Self'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
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// CHECK:STDOUT: {kind: 'RequirementEqualEqual', text: '==', subtree_size: 4},
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// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 7},
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// CHECK:STDOUT: {kind: 'LetBindingPattern', text: ':', subtree_size: 9},
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// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 11},
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// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 14},
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// CHECK:STDOUT: {kind: 'InterfaceIntroducer', text: 'interface'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'I'},
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// CHECK:STDOUT: {kind: 'InterfaceDefinitionStart', text: '{', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
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// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'Foo'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Bar'},
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// CHECK:STDOUT: {kind: 'RequirementImpls', text: 'impls', subtree_size: 4},
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// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 7},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', subtree_size: 10},
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// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 12},
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// CHECK:STDOUT: {kind: 'InterfaceDefinition', text: '}', subtree_size: 16},
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// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
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// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'U'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'V'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'RequirementEqual', text: '=', subtree_size: 5},
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// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 8},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', subtree_size: 11},
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// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 13},
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// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
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// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'F'},
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// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
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// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
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// CHECK:STDOUT: {kind: 'LetIntroducer', text: 'let'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'U'},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
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// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'W'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'X'},
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// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'RequirementEqualEqual', text: '==', subtree_size: 5},
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// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', subtree_size: 8},
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// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', subtree_size: 11},
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// CHECK:STDOUT: {kind: 'LetDecl', text: ';', subtree_size: 13},
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// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 19},
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// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
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// CHECK:STDOUT: ]
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