mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-30 22:02:41 +01:00
Richard Smith
49024c8d83
If a keyword or a sized type literal (eg, `f2`) is used in a context where we are confident that we are expecting an identifier -- either before a `:` in a binding pattern or after a `.` in a member access or designator -- then recover as if a raw identifier was used. This appears to be a particular stumbling block for coding agents, so seems worth paying special attention to. Add a mechanism to the tokenized buffer to track additional tokens synthesized for error recovery so that we can keep the lexed token sequence immutable and still satisfy the invariants throughout the rest of the toolchain for recovery tokens. Thanks to chandlerc for suggesting this approach!
51 lines
2.7 KiB
Plaintext
51 lines
2.7 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/var/fail_bad_name.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/var/fail_bad_name.carbon
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// CHECK:STDERR: fail_bad_name.carbon:[[@LINE+4]]:6: error: expected expression [ExpectedExpr]
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// CHECK:STDERR: var *;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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var *;
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// CHECK:STDERR: fail_bad_name.carbon:[[@LINE+4]]:11: error: expected name in binding pattern; prefix reserved word with `r#` to form a valid identifier [ExpectedBindingPattern]
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// CHECK:STDERR: var choice: i32;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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var choice: i32;
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// CHECK:STDERR: fail_bad_name.carbon:[[@LINE+4]]:7: error: expected name in binding pattern; prefix reserved word with `r#` to form a valid identifier [ExpectedBindingPattern]
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// CHECK:STDERR: var f2: f32;
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// CHECK:STDERR: ^
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// CHECK:STDERR:
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var f2: f32;
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// CHECK:STDOUT: - filename: fail_bad_name.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: 'VariableIntroducer', text: 'var'},
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// CHECK:STDOUT: {kind: 'InvalidParse', text: ';', has_error: yes},
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// CHECK:STDOUT: {kind: 'PrefixOperatorStar', text: '*', has_error: yes, subtree_size: 2},
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// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 5},
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// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'choice'},
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// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
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// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 4},
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// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 6},
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// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'f2'},
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// CHECK:STDOUT: {kind: 'FloatTypeLiteral', text: 'f32'},
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// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 4},
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// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 6},
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// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
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// CHECK:STDOUT: ]
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