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Let variables (#1095)

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* Modify parser and AST nodes to include let statement

* Implement let variables

* Remove redundant code in fail_match_choice test

* Add comment for has_value_category()

* Apply suggestions from code review

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* clang-format changes

* Update comments for new BindingPattern methods

* Implement nested vars in patterns

* Apply suggestions from @geoffromer's code review

Co-authored-by: Geoff Romer <gromer@google.com>

* Implement changes from code review.

* Remove maybe_var_pattern grammar rule

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Darshal Shetty
2022-03-11 16:30:24 -05:00
committed by GitHub
co-authored by Jon Meow Geoff Romer
parent 93842ad878
commit 20b272446f
20 changed files with 340 additions and 23 deletions
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executable_semantics/testdata/let/nested_tuple_pattern.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: 0
package ExecutableSemanticsTest api;
choice Ints {
None,
One(i32),
Two(i32,i32)
}
fn Main() -> i32 {
let (var Ints.Two(a1: auto, var a2: auto), ((b: auto, var c:auto), var (d: auto, e:auto))) = (Ints.Two(1, 10), ((2, 3), (4, 5)));
a1 = 0;
a2 = 0;
c = 0;
d = 0;
e = 0;
return 0;
}