TIL Rust has an ambiguity `if Foo {}` -- is `Foo` a value of type bool, or a struct?
Rust solves this by defining a grammar production 'any expression except struct literals' and using it in this position. https://rust-lang.github.io/rfcs/0092-struct-grammar.html
Related Posts
I've been using "Expected Int, but got String" for my type error messages, but I've been wondering if I could do better.
"Expected Int here, but this value has type String" or "This expression requires Int, but the value is String".
Do you have a favourite?
I'm pretty impressed with Cursor: I've successfully asked it to perform codebase transforms in English, and it's worked!
E.g. "Replace all calls foo(..., true) with foo_immediate(...) define a foo_immediate function".
I'm still reading the diff and checking tests -- it's still AI after all.
When a tool supports both regular expressions and literal strings, which should be the default?
If you default to regex, users can match more strings than they realise (e.g. `foo.txt`) or less (e.g. `foo(bar)`).
I typically see regex as the default, but I prefer the opposite.