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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 20:24:58 +01:00
Richard Smith
74d52738ff
A `let` declaration is represented by a `bind_name` node in SemIR: ```carbon-semir %b: i32 = bind_name "b", %a ``` Because `Check` encounters the pattern before it sees the value, we first create the `bind_name` node with an unset value and don't add it to the block. Then, once we've seen and converted the initializer, we update the `bind_name` to have the value and add it to the current block, after the initializer code.
40 lines
1.9 KiB
Plaintext
40 lines
1.9 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:STDERR: fail_missing_value.carbon:[[@LINE+3]]:11: ERROR: Expected `=`; `let` declaration must have an initializer.
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// CHECK:STDERR: let a: i32;
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// CHECK:STDERR: ^
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let a: i32;
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fn F() {
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// CHECK:STDERR: fail_missing_value.carbon:[[@LINE+3]]:13: ERROR: Expected `=`; `let` declaration must have an initializer.
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// CHECK:STDERR: let b: i32;
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// CHECK:STDERR: ^
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let b: i32;
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}
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// CHECK:STDOUT: - filename: fail_missing_value.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: 'LetIntroducer', text: 'let'},
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// CHECK:STDOUT: {kind: 'Name', text: 'a'},
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// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
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// CHECK:STDOUT: {kind: 'PatternBinding', text: ':', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'LetDeclaration', text: ';', has_error: yes, subtree_size: 5},
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// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
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// CHECK:STDOUT: {kind: 'Name', 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: 'LetIntroducer', text: 'let'},
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// CHECK:STDOUT: {kind: 'Name', text: 'b'},
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// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
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// CHECK:STDOUT: {kind: 'PatternBinding', text: ':', subtree_size: 3},
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// CHECK:STDOUT: {kind: 'LetDeclaration', text: ';', has_error: yes, subtree_size: 5},
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// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 11},
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// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
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// CHECK:STDOUT: ]
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