mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 18:31:08 +01:00
Richard Smith
2c45cb3be8
We model `if a then b else` as a prefix operator for parsing precedence purposes. The rule that a statement starting with `if` is never an `if` expression is handled implicitly because the statement parser never invokes the expression parser for a statement starting with `if`. This exposed a bug in our diagnosis of the whitespace rule for prefix operators, which was incorrectly being applied to non-symbolic operators in some cases, and was producing a bogus second diagnostic in some cases, which is also fixed here.
30 lines
1.6 KiB
Plaintext
30 lines
1.6 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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// CHECK:STDOUT: [
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// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
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// CHECK:STDOUT: {kind: 'DeclaredName', text: 'F'},
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// CHECK:STDOUT: {kind: 'ParameterListStart', text: '('},
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// CHECK:STDOUT: {kind: 'ParameterList', text: ')', subtree_size: 2},
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// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
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// CHECK:STDOUT: {kind: 'IfConditionStart', text: 'if', has_error: yes},
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// CHECK:STDOUT: {kind: 'NameReference', text: 'true'},
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// CHECK:STDOUT: {kind: 'IfCondition', text: 'if', has_error: yes, subtree_size: 3},
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// CHECK:STDOUT: {kind: 'CodeBlockStart', text: 'then', has_error: yes},
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// CHECK:STDOUT: {kind: 'InvalidParse', text: 'then', has_error: yes},
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// CHECK:STDOUT: {kind: 'ExpressionStatement', text: ';', has_error: yes, subtree_size: 2},
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// CHECK:STDOUT: {kind: 'CodeBlock', text: 'then', has_error: yes, subtree_size: 4},
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// CHECK:STDOUT: {kind: 'IfStatement', text: 'if', subtree_size: 8},
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// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 14},
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// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
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// CHECK:STDOUT: ]
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fn F() {
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// CHECK:STDERR: fail_top_level_if.carbon:[[@LINE+3]]:6: Expected `(` after `if`.
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// CHECK:STDERR: fail_top_level_if.carbon:[[@LINE+2]]:11: Expected braced code block.
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// CHECK:STDERR: fail_top_level_if.carbon:[[@LINE+1]]:11: Expected expression.
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if true then 1 else 2;
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}
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