* tests/synclines.at (AT_TEST_SYNCLINE): Be robust to GCC's location with columns. * tests/conflicts.at (%nonassoc and eof): Don't use `error.h'. All reported by Paul Eggert.
* tests/atlocal.at (GCC): New. * tests/synclines.at (AT_TEST_SYNCLINE): New macro. (Prologue synch line, ,%union synch line, Postprologue synch line) (Action synch line, Epilogue synch line): New tests. * src/reader.c (parse_union_decl): Define the muscle stype_line. * data/bison.simple, data/bison.c++: Use it.