Type errors

semantic error: type mismatch for identifier 'foo' $\ldots$ string vs. long
In this case, the identifier foo was previously inferred as a numeric type (``long''), but at the given point is being used as a string. Similar messages appear if an array index or function parameter slot is used with conflicting types.

semantic error: unresolved type for identifier 'foo'
The identifier foo was used, for example in a print, but without any operations that could assign it a type. Similar messages may appear if a symbol is misspelled by a typo.

semantic error: Expecting symbol or array index expression
Something other than an assignable lvalue was on the left hand sign of an assignment.