Create `defer` syntax and `OP_PUSHDEFER` opcode

Adds syntax `defer { BLOCK }` to create a deferred block; code that is
deferred until the scope exits. This syntax is guarded by

  use feature 'defer';

Adds a new opcode, `OP_PUSHDEFER`, which is a LOGOP whose `op_other` field
gives the start of an optree to be deferred until scope exit. That op
pointer will be stored on the save stack and invoked as part of scope
unwind.

Included is support for `B::Deparse` to deparse the optree back into
syntax.

1 files changed, 218 insertions, 217 deletions

diff --git a/keywords.h b/keywords.h
index 82694905cb..84e7719148 100644
--- a/keywords.h
+++ b/keywords.h
@@ -55,223 +55,224 @@
 #define KEY_dbmclose		39
 #define KEY_dbmopen		40
 #define KEY_default		41
-#define KEY_defined		42
-#define KEY_delete		43
-#define KEY_die			44
-#define KEY_do			45
-#define KEY_dump		46
-#define KEY_each		47
-#define KEY_else		48
-#define KEY_elsif		49
-#define KEY_endgrent		50
-#define KEY_endhostent		51
-#define KEY_endnetent		52
-#define KEY_endprotoent		53
-#define KEY_endpwent		54
-#define KEY_endservent		55
-#define KEY_eof			56
-#define KEY_eq			57
-#define KEY_eval		58
-#define KEY_evalbytes		59
-#define KEY_exec		60
-#define KEY_exists		61
-#define KEY_exit		62
-#define KEY_exp			63
-#define KEY_fc			64
-#define KEY_fcntl		65
-#define KEY_fileno		66
-#define KEY_flock		67
-#define KEY_for			68
-#define KEY_foreach		69
-#define KEY_fork		70
-#define KEY_format		71
-#define KEY_formline		72
-#define KEY_ge			73
-#define KEY_getc		74
-#define KEY_getgrent		75
-#define KEY_getgrgid		76
-#define KEY_getgrnam		77
-#define KEY_gethostbyaddr	78
-#define KEY_gethostbyname	79
-#define KEY_gethostent		80
-#define KEY_getlogin		81
-#define KEY_getnetbyaddr	82
-#define KEY_getnetbyname	83
-#define KEY_getnetent		84
-#define KEY_getpeername		85
-#define KEY_getpgrp		86
-#define KEY_getppid		87
-#define KEY_getpriority		88
-#define KEY_getprotobyname	89
-#define KEY_getprotobynumber	90
-#define KEY_getprotoent		91
-#define KEY_getpwent		92
-#define KEY_getpwnam		93
-#define KEY_getpwuid		94
-#define KEY_getservbyname	95
-#define KEY_getservbyport	96
-#define KEY_getservent		97
-#define KEY_getsockname		98
-#define KEY_getsockopt		99
-#define KEY_given		100
-#define KEY_glob		101
-#define KEY_gmtime		102
-#define KEY_goto		103
-#define KEY_grep		104
-#define KEY_gt			105
-#define KEY_hex			106
-#define KEY_if			107
-#define KEY_index		108
-#define KEY_int			109
-#define KEY_ioctl		110
-#define KEY_isa			111
-#define KEY_join		112
-#define KEY_keys		113
-#define KEY_kill		114
-#define KEY_last		115
-#define KEY_lc			116
-#define KEY_lcfirst		117
-#define KEY_le			118
-#define KEY_length		119
-#define KEY_link		120
-#define KEY_listen		121
-#define KEY_local		122
-#define KEY_localtime		123
-#define KEY_lock		124
-#define KEY_log			125
-#define KEY_lstat		126
-#define KEY_lt			127
-#define KEY_m			128
-#define KEY_map			129
-#define KEY_mkdir		130
-#define KEY_msgctl		131
-#define KEY_msgget		132
-#define KEY_msgrcv		133
-#define KEY_msgsnd		134
-#define KEY_my			135
-#define KEY_ne			136
-#define KEY_next		137
-#define KEY_no			138
-#define KEY_not			139
-#define KEY_oct			140
-#define KEY_open		141
-#define KEY_opendir		142
-#define KEY_or			143
-#define KEY_ord			144
-#define KEY_our			145
-#define KEY_pack		146
-#define KEY_package		147
-#define KEY_pipe		148
-#define KEY_pop			149
-#define KEY_pos			150
-#define KEY_print		151
-#define KEY_printf		152
-#define KEY_prototype		153
-#define KEY_push		154
-#define KEY_q			155
-#define KEY_qq			156
-#define KEY_qr			157
-#define KEY_quotemeta		158
-#define KEY_qw			159
-#define KEY_qx			160
-#define KEY_rand		161
-#define KEY_read		162
-#define KEY_readdir		163
-#define KEY_readline		164
-#define KEY_readlink		165
-#define KEY_readpipe		166
-#define KEY_recv		167
-#define KEY_redo		168
-#define KEY_ref			169
-#define KEY_rename		170
-#define KEY_require		171
-#define KEY_reset		172
-#define KEY_return		173
-#define KEY_reverse		174
-#define KEY_rewinddir		175
-#define KEY_rindex		176
-#define KEY_rmdir		177
-#define KEY_s			178
-#define KEY_say			179
-#define KEY_scalar		180
-#define KEY_seek		181
-#define KEY_seekdir		182
-#define KEY_select		183
-#define KEY_semctl		184
-#define KEY_semget		185
-#define KEY_semop		186
-#define KEY_send		187
-#define KEY_setgrent		188
-#define KEY_sethostent		189
-#define KEY_setnetent		190
-#define KEY_setpgrp		191
-#define KEY_setpriority		192
-#define KEY_setprotoent		193
-#define KEY_setpwent		194
-#define KEY_setservent		195
-#define KEY_setsockopt		196
-#define KEY_shift		197
-#define KEY_shmctl		198
-#define KEY_shmget		199
-#define KEY_shmread		200
-#define KEY_shmwrite		201
-#define KEY_shutdown		202
-#define KEY_sin			203
-#define KEY_sleep		204
-#define KEY_socket		205
-#define KEY_socketpair		206
-#define KEY_sort		207
-#define KEY_splice		208
-#define KEY_split		209
-#define KEY_sprintf		210
-#define KEY_sqrt		211
-#define KEY_srand		212
-#define KEY_stat		213
-#define KEY_state		214
-#define KEY_study		215
-#define KEY_sub			216
-#define KEY_substr		217
-#define KEY_symlink		218
-#define KEY_syscall		219
-#define KEY_sysopen		220
-#define KEY_sysread		221
-#define KEY_sysseek		222
-#define KEY_system		223
-#define KEY_syswrite		224
-#define KEY_tell		225
-#define KEY_telldir		226
-#define KEY_tie			227
-#define KEY_tied		228
-#define KEY_time		229
-#define KEY_times		230
-#define KEY_tr			231
-#define KEY_try			232
-#define KEY_truncate		233
-#define KEY_uc			234
-#define KEY_ucfirst		235
-#define KEY_umask		236
-#define KEY_undef		237
-#define KEY_unless		238
-#define KEY_unlink		239
-#define KEY_unpack		240
-#define KEY_unshift		241
-#define KEY_untie		242
-#define KEY_until		243
-#define KEY_use			244
-#define KEY_utime		245
-#define KEY_values		246
-#define KEY_vec			247
-#define KEY_wait		248
-#define KEY_waitpid		249
-#define KEY_wantarray		250
-#define KEY_warn		251
-#define KEY_when		252
-#define KEY_while		253
-#define KEY_write		254
-#define KEY_x			255
-#define KEY_xor			256
-#define KEY_y			257
+#define KEY_defer		42
+#define KEY_defined		43
+#define KEY_delete		44
+#define KEY_die			45
+#define KEY_do			46
+#define KEY_dump		47
+#define KEY_each		48
+#define KEY_else		49
+#define KEY_elsif		50
+#define KEY_endgrent		51
+#define KEY_endhostent		52
+#define KEY_endnetent		53
+#define KEY_endprotoent		54
+#define KEY_endpwent		55
+#define KEY_endservent		56
+#define KEY_eof			57
+#define KEY_eq			58
+#define KEY_eval		59
+#define KEY_evalbytes		60
+#define KEY_exec		61
+#define KEY_exists		62
+#define KEY_exit		63
+#define KEY_exp			64
+#define KEY_fc			65
+#define KEY_fcntl		66
+#define KEY_fileno		67
+#define KEY_flock		68
+#define KEY_for			69
+#define KEY_foreach		70
+#define KEY_fork		71
+#define KEY_format		72
+#define KEY_formline		73
+#define KEY_ge			74
+#define KEY_getc		75
+#define KEY_getgrent		76
+#define KEY_getgrgid		77
+#define KEY_getgrnam		78
+#define KEY_gethostbyaddr	79
+#define KEY_gethostbyname	80
+#define KEY_gethostent		81
+#define KEY_getlogin		82
+#define KEY_getnetbyaddr	83
+#define KEY_getnetbyname	84
+#define KEY_getnetent		85
+#define KEY_getpeername		86
+#define KEY_getpgrp		87
+#define KEY_getppid		88
+#define KEY_getpriority		89
+#define KEY_getprotobyname	90
+#define KEY_getprotobynumber	91
+#define KEY_getprotoent		92
+#define KEY_getpwent		93
+#define KEY_getpwnam		94
+#define KEY_getpwuid		95
+#define KEY_getservbyname	96
+#define KEY_getservbyport	97
+#define KEY_getservent		98
+#define KEY_getsockname		99
+#define KEY_getsockopt		100
+#define KEY_given		101
+#define KEY_glob		102
+#define KEY_gmtime		103
+#define KEY_goto		104
+#define KEY_grep		105
+#define KEY_gt			106
+#define KEY_hex			107
+#define KEY_if			108
+#define KEY_index		109
+#define KEY_int			110
+#define KEY_ioctl		111
+#define KEY_isa			112
+#define KEY_join		113
+#define KEY_keys		114
+#define KEY_kill		115
+#define KEY_last		116
+#define KEY_lc			117
+#define KEY_lcfirst		118
+#define KEY_le			119
+#define KEY_length		120
+#define KEY_link		121
+#define KEY_listen		122
+#define KEY_local		123
+#define KEY_localtime		124
+#define KEY_lock		125
+#define KEY_log			126
+#define KEY_lstat		127
+#define KEY_lt			128
+#define KEY_m			129
+#define KEY_map			130
+#define KEY_mkdir		131
+#define KEY_msgctl		132
+#define KEY_msgget		133
+#define KEY_msgrcv		134
+#define KEY_msgsnd		135
+#define KEY_my			136
+#define KEY_ne			137
+#define KEY_next		138
+#define KEY_no			139
+#define KEY_not			140
+#define KEY_oct			141
+#define KEY_open		142
+#define KEY_opendir		143
+#define KEY_or			144
+#define KEY_ord			145
+#define KEY_our			146
+#define KEY_pack		147
+#define KEY_package		148
+#define KEY_pipe		149
+#define KEY_pop			150
+#define KEY_pos			151
+#define KEY_print		152
+#define KEY_printf		153
+#define KEY_prototype		154
+#define KEY_push		155
+#define KEY_q			156
+#define KEY_qq			157
+#define KEY_qr			158
+#define KEY_quotemeta		159
+#define KEY_qw			160
+#define KEY_qx			161
+#define KEY_rand		162
+#define KEY_read		163
+#define KEY_readdir		164
+#define KEY_readline		165
+#define KEY_readlink		166
+#define KEY_readpipe		167
+#define KEY_recv		168
+#define KEY_redo		169
+#define KEY_ref			170
+#define KEY_rename		171
+#define KEY_require		172
+#define KEY_reset		173
+#define KEY_return		174
+#define KEY_reverse		175
+#define KEY_rewinddir		176
+#define KEY_rindex		177
+#define KEY_rmdir		178
+#define KEY_s			179
+#define KEY_say			180
+#define KEY_scalar		181
+#define KEY_seek		182
+#define KEY_seekdir		183
+#define KEY_select		184
+#define KEY_semctl		185
+#define KEY_semget		186
+#define KEY_semop		187
+#define KEY_send		188
+#define KEY_setgrent		189
+#define KEY_sethostent		190
+#define KEY_setnetent		191
+#define KEY_setpgrp		192
+#define KEY_setpriority		193
+#define KEY_setprotoent		194
+#define KEY_setpwent		195
+#define KEY_setservent		196
+#define KEY_setsockopt		197
+#define KEY_shift		198
+#define KEY_shmctl		199
+#define KEY_shmget		200
+#define KEY_shmread		201
+#define KEY_shmwrite		202
+#define KEY_shutdown		203
+#define KEY_sin			204
+#define KEY_sleep		205
+#define KEY_socket		206
+#define KEY_socketpair		207
+#define KEY_sort		208
+#define KEY_splice		209
+#define KEY_split		210
+#define KEY_sprintf		211
+#define KEY_sqrt		212
+#define KEY_srand		213
+#define KEY_stat		214
+#define KEY_state		215
+#define KEY_study		216
+#define KEY_sub			217
+#define KEY_substr		218
+#define KEY_symlink		219
+#define KEY_syscall		220
+#define KEY_sysopen		221
+#define KEY_sysread		222
+#define KEY_sysseek		223
+#define KEY_system		224
+#define KEY_syswrite		225
+#define KEY_tell		226
+#define KEY_telldir		227
+#define KEY_tie			228
+#define KEY_tied		229
+#define KEY_time		230
+#define KEY_times		231
+#define KEY_tr			232
+#define KEY_try			233
+#define KEY_truncate		234
+#define KEY_uc			235
+#define KEY_ucfirst		236
+#define KEY_umask		237
+#define KEY_undef		238
+#define KEY_unless		239
+#define KEY_unlink		240
+#define KEY_unpack		241
+#define KEY_unshift		242
+#define KEY_untie		243
+#define KEY_until		244
+#define KEY_use			245
+#define KEY_utime		246
+#define KEY_values		247
+#define KEY_vec			248
+#define KEY_wait		249
+#define KEY_waitpid		250
+#define KEY_wantarray		251
+#define KEY_warn		252
+#define KEY_when		253
+#define KEY_while		254
+#define KEY_write		255
+#define KEY_x			256
+#define KEY_xor			257
+#define KEY_y			258
 
 /* Generated from:
- * 3a4f2004642b00b871c01cbdc018f6ca5ead6b4e0b2b184120c60b0b62a229dd regen/keywords.pl
+ * de1ee232f68ea8ae75d09f4f70b58fee8a6e6244dec3ab68baab54f7af9ce306 regen/keywords.pl
  * ex: set ro: */