P001 -- Parser Error

The tokens are valid but the sequence does not match the grammar. Messages have the shape expected X, found Y and point at the offending token.

Examples

Unbalanced delimiter:

fn main() {
  let x = (1;
}

error[P001]: 2:13: expected ')', found ;

Brace where the grammar expects a parameter identifier:

fn main( { }

error[P001]: 1:12: expected identifier, found '{'

Fix

• Balance every (), [] and {} pair.
• Check the line and column in the message; the problem is usually the token just before or at it.
• Statement terminators matter: let x = 1; needs its semicolon.

Notes

• The parser stops the pipeline: no type checking happens until P001 is resolved.
• The compiler prints a suggestion for the common cases (did you mean ...).