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carbon-lang/toolchain/parse/testdata/where_expr/fail_rewrite.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/fail_rewrite.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/where_expr/fail_rewrite.carbon
// Tests for reporting errors when a rewrite requirement doesn't follow
// `where .designator = rewrite`.
// --- fail_not_designator.carbon
// CHECK:STDERR: fail_not_designator.carbon:[[@LINE+4]]:37: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn NotDesignator(T:! type where i32 = .U);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn NotDesignator(T:! type where i32 = .U);
// --- fail_designator_in_parens.carbon
// CHECK:STDERR: fail_designator_in_parens.carbon:[[@LINE+4]]:40: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn DesignatorInParens(V:! I where (.J) = bool);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn DesignatorInParens(V:! I where (.J) = bool);
// --- fail_dot_self.carbon
// CHECK:STDERR: fail_dot_self.carbon:[[@LINE+4]]:30: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn DotSelf(W:! K where .Self = f32);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn DotSelf(W:! K where .Self = f32);
// --- fail_dot_keyword.carbon
// CHECK:STDERR: fail_dot_keyword.carbon:[[@LINE+4]]:28: error: expected identifier or `Self` after `.` [ExpectedIdentifierOrSelfAfterPeriod]
// CHECK:STDERR: fn DotKeyword(W:! K where .and = u8);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
fn DotKeyword(W:! K where .and = u8);
// --- fail_postfix_after_designator.carbon
// CHECK:STDERR: fail_postfix_after_designator.carbon:[[@LINE+4]]:43: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn PostfixAfterDesignator(X:! L where .M* = u64*);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn PostfixAfterDesignator(X:! L where .M* = u64*);
// --- fail_binary_op_after_designator.carbon
// CHECK:STDERR: fail_binary_op_after_designator.carbon:[[@LINE+4]]:48: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn BinaryOpAfterDesignator(Y:! N where .O + .P = {});
// CHECK:STDERR: ^
// CHECK:STDERR:
fn BinaryOpAfterDesignator(Y:! N where .O + .P = {});
// --- fail_after_and.carbon
// CHECK:STDERR: fail_after_and.carbon:[[@LINE+4]]:43: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn AfterAnd(Z:! Q where .R impls S and () = .A);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn AfterAnd(Z:! Q where .R impls S and () = .A);
// CHECK:STDOUT: - filename: fail_not_designator.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'NotDesignator'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'T'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'TypeTypeLiteral', text: 'type'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 7},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 9},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 12},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_designator_in_parens.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'DesignatorInParens'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'V'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'I'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ParenExprStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'J'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ParenExpr', text: ')', subtree_size: 4},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 7},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 12},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 15},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_dot_self.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'DotSelf'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'W'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'K'},
// 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: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 8},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 13},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_dot_keyword.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'DotKeyword'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'W'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'K'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'and', has_error: yes},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 8},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 13},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_postfix_after_designator.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'PostfixAfterDesignator'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'X'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'L'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'M'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'PostfixOperatorStar', text: '*', subtree_size: 3},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 6},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 9},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 11},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 14},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_binary_op_after_designator.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'BinaryOpAfterDesignator'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'Y'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'N'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'O'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'P'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'InfixOperatorPlus', text: '+', subtree_size: 5},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 8},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 11},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 13},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 16},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_after_and.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'AfterAnd'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'Z'},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPatternStart', text: ':!', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Q'},
// CHECK:STDOUT: {kind: 'WhereOperand', text: 'where', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'R'},
// CHECK:STDOUT: {kind: 'DesignatorExpr', text: '.', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'S'},
// CHECK:STDOUT: {kind: 'RequirementImpls', text: 'impls', subtree_size: 4},
// CHECK:STDOUT: {kind: 'RequirementAnd', text: 'and'},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'WhereExpr', text: 'where', has_error: yes, subtree_size: 10},
// CHECK:STDOUT: {kind: 'CompileTimeBindingPattern', text: ':!', has_error: yes, subtree_size: 13},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 15},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 18},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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