‏The right to left mark (U+2000F) can also be fun.

While the language can be hard to get used to, the error messages are mostly great.
But sometimes you can send it on a goose chase with impossible type inference.

If those are normal integers, the compiler optimizes that to a simple compare and branch/cmov.

My IDE says: '(', '+', '-', '.', ';', <operator>, '[' or '}' expected, got ';'
But the rust compiler explains

error: unknown start of token: \u{37e}  
help: Unicode character ';' (Greek Question Mark) looks like ';' (Semicolon), but it is not```   
what a killjoy.

Now draw her bouldering, I think it fits her style.