Syntatically accept become expressions

2022-11-16 18:36:17 +00:00
parent 8d1fa473dd
commit d7713feb99
14 changed files with 71 additions and 2 deletions
--- a/compiler/rustc_ast/src/util/parser.rs
+++ b/compiler/rustc_ast/src/util/parser.rs
@@ -245,6 +245,7 @@ pub enum ExprPrecedence {
    Ret,
    Yield,
    Yeet,
+    Become,

    Range,

@@ -298,7 +299,8 @@ impl ExprPrecedence {
            | ExprPrecedence::Continue
            | ExprPrecedence::Ret
            | ExprPrecedence::Yield
-            | ExprPrecedence::Yeet => PREC_JUMP,
+            | ExprPrecedence::Yeet
+            | ExprPrecedence::Become => PREC_JUMP,

            // `Range` claims to have higher precedence than `Assign`, but `x .. x = x` fails to
            // parse, instead of parsing as `(x .. x) = x`. Giving `Range` a lower precedence