Comments

The compiler accepts line comments.

// A line comment runs to the end of the line.

fn main() {
    // Comments are whitespace to the parser.
}

Line comments are allowed anywhere whitespace is allowed. The Tree-sitter grammar recognizes block comments too, but the current compiler lexer does not accept /* ... */ yet.

Warning

Do not use block comments in source that must compile with the current compiler. Editor highlighting may accept /* ... */ because Tree-sitter already recognizes it, but the current compiler rejects it.