fix error messages for multi-statements

IE Statement or factor

Add optional arg for match which overwrites the printed expected

EX/ Send "statement" as an optional arg to be printed in the place of assignment statement.

Locate the match implementation and the error-message handling for IE statements or factors. Read how assignment statements are currently shown, then verify that an optional statement argument can replace the printed expected text without changing the default behavior.

Written by the indexing model from the issue text.