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Check exhaustiveness of function-ending match statements (#882)

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Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
This commit is contained in:
Geoff Romer
2021-10-13 16:04:43 -07:00
committed by GitHub
co-authored by Jon Meow
parent 652bee6d99
commit c2140c6cb9
8 changed files with 62 additions and 0 deletions
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executable_semantics/testdata/function/fail_non_exhaustive_match.carbon
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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
//
// RUN: not executable_semantics %s 2>&1 | \
// RUN: FileCheck --match-full-lines --allow-unused-prefixes=false %s
// RUN: not executable_semantics --trace %s 2>&1 | \
// RUN: FileCheck --match-full-lines --allow-unused-prefixes %s
// AUTOUPDATE: executable_semantics %s
// CHECK: COMPILATION ERROR: {{.*}}/executable_semantics/testdata/function/fail_non_exhaustive_match.carbon:18: non-exhaustive match may allow control-flow to reach the end of a function that provides a `->` return type
package ExecutableSemanticsTest api;
fn main() -> i32 {
match (0) {
case 1 => return 0;
}
}
executable_semantics/testdata/function/return_exhaustive_match.carbon
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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
//
// RUN: executable_semantics %s 2>&1 | \
// RUN: FileCheck --match-full-lines --allow-unused-prefixes=false %s
// RUN: executable_semantics --trace %s 2>&1 | \
// RUN: FileCheck --match-full-lines --allow-unused-prefixes %s
// AUTOUPDATE: executable_semantics %s
// CHECK: result: 1
package ExecutableSemanticsTest api;
fn main() -> i32 {
match (0) {
case _: auto => return 1;
}
// We don't need a `return` here because the match is exhaustive.
}