SCM_SYM_WB        352 src/regexp.c           case 'b': return SCM_SYM_WB;
SCM_SYM_WB       1070 src/regexp.c               if (SCM_EQ(ast, SCM_SYM_WB)) {
SCM_SYM_WB       1530 src/regexp.c               || SCM_EQ(ast, SCM_SYM_WB) || SCM_EQ(ast, SCM_SYM_NWB)