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Clarify and simplify handling of lvalues (#956)

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- Rename `PointerValue` to `LValue` to reflect how it's actually used. We can introduce a `PointerValue` type when we add support for actual pointer values.
- Remove support for pattern assignment. It's unclear if Carbon will support this, and even if we do, it raises questions that should first be addressed in a language proposal, like "is the left-hand side of `(x, y) = (1, 2)` an lvalue, or a pattern, or both, or something else entirely?"
This commit is contained in:
Geoff Romer
2021-11-23 14:13:08 -08:00
committed by GitHub
parent 6ae85bd13a
commit 3f7e1cd3fb
7 changed files with 25 additions and 110 deletions
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executable_semantics/testdata/tuple/assign.carbon
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-19
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@@ -1,19 +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: 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: 0
package ExecutableSemanticsTest api;
fn Main() -> i32 {
var x: auto = 0;
var y: auto = 1;
(x, y) = (5, -5);
return x + y;
}