Various fixes to function parsing

- Newlines are handled better
- Types are actually parsed

parser/func.go

@@ -69,7 +69,9 @@ func (parser *ParsingOperation) parseFuncArguments (
 		if parser.token.Is(lexer.TokenKindSeparator) {
 			// if we have encountered a separator, that means our
 			// work is done here.
-			err = parser.expect(lexer.TokenKindNewline)
+			err = parser.nextToken(lexer.TokenKindNewline)
+			if err != nil { return }
+			err = parser.nextToken()
 			return
 		}