const char *lex_get_file_name (const struct lexer *);
struct msg_location *lex_get_location (const struct lexer *, int n0, int n1);
struct msg_location *lex_get_lines (const struct lexer *, int n0, int n1);
+void lex_extend_location (const struct lexer *, int n, struct msg_location *);
const char *lex_get_encoding (const struct lexer *);
/* Issuing errors. */