1 An identifier is bound more than once in a pattern.
3 Erroneous code example:
7 (x, x) => {} // error: identifier `x` is bound more than once in the
12 Please verify you didn't misspell identifiers' name. Example:
20 Or maybe did you mean to unify? Consider using a guard:
23 # let (A, B, C) = (1, 2, 3);
25 (x, x2, see) if x == x2 => { /* A and B are equal, do one thing */ }
26 (y, z, see) => { /* A and B unequal; do another thing */ }