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Implement auto return types, removing => returns (#850)

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This implements #826, I think covering everything important there.

Regarding ReturnTypeContext, I broke that out because it started feeling like a significant number of args to be passing around, and I think this makes the association inside type checking clearer.

Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Jon Meow
2021-09-27 11:17:24 -07:00
committed by GitHub
co-authored by Geoff Romer
parent 04ab30f231
commit 5aa958345b
11 changed files with 164 additions and 46 deletions
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executable_semantics/testdata/return/fail_auto.carbon
Vendored
-20
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@@ -1,20 +0,0 @@
// 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/return/fail_auto.carbon:14: syntax error, unexpected AUTO
package ExecutableSemanticsTest api;
fn F() -> auto {
return 0;
}
fn main() -> i32 {
return F();
}