7cf3268666
This is a port of CL 402255 from the syntax package to go/parser with adjustments because of the different AST structure. Accept ~x as ordinary unary expression in the parser but recognize such expressions as invalid in the type checker. This change opens the door to recognizing complex type constraint literals such as `*E|~int` in `[P *E|~int]` and parse them correctly instead of reporting a parse error because `P*E|~int` syntactically looks like an incorrect array length expression (binary expression where the RHS of | is an invalid unary expression ~int). As a result, the parser is more forgiving with expressions but the type checker will reject invalid uses as before. We could pass extra information into the binary/unary expression parse functions to prevent the use of ~ in invalid situations but it doesn't seem worth the trouble. In fact it may be advantageous to allow a more liberal expression syntax especially in the presence of errors (better parser synchronization after an error). Preparation for fixing #52559. Change-Id: I48562cf40ccf5f14c20fcd92c40a0303b2d8b2b8 Reviewed-on: https://go-review.googlesource.com/c/go/+/403696 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: David Chase <drchase@google.com> |
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