mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Adrien Leravat
d0645c6a85
Rename value categories to expression categories based on [Discord discussion](https://discord.com/channels/655572317891461132/753021843459538996/1092924035517665332) regarding naming and behavior. >* let expression -> value expression >* var expression -> reference expression >* located expression -> initializing expression >So: >- "value expressions" produce values (with no associated location). "reference expressions" produce a location of an existing value. "initializing expressions" take a location and initialize it. >- A let binding is initialized by a value expression, because lets represent values (with category conversions performed as needed, but if a conversion is performed from a different category of expression, the value of the object is pinned for the lifetime of the let). >- A var binding is initialized by an initializing expression, without performing a copy (with category conversions performed as needed, calling a copy constructor if the initializer is a different expression category). >- The & operator requires a reference expression, and it's an error to give it other kinds. >- The left-hand side of . requires a value expression when calling a function with a non-addr receiver, and requires a reference expression when calling a function with an addr receiver (it's an error to give it a value expression, and for an initializing expression, a temporary is materialized). Changes * Rename "value category" to "expression category" * Rename Var and Let value categories to Value, Reference, and Initializing expression * Rename `lvalue` to `location` (most of the time)
22 lines
610 B
Plaintext
22 lines
610 B
Plaintext
// 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
|
|
//
|
|
// AUTOUPDATE
|
|
// RUN: %{not} %{explorer-run}
|
|
// RUN: %{not} %{explorer-run-trace}
|
|
|
|
package ExplorerTest api;
|
|
|
|
fn f((var x: i32, y: i32)) -> i32 {
|
|
x = 0;
|
|
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/let/fail_function_args.carbon:[[@LINE+1]]: Only assign a reference expression can be assigned, but got `'y`'
|
|
y = 0;
|
|
return x - 1;
|
|
}
|
|
|
|
fn Main() -> i32 {
|
|
var t: auto = (1, 2);
|
|
return f(t);
|
|
}
|