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of re_compile_fastmap and generalizing it a little bit so that it
can also just return whether a given (sub)pattern can match the empty
string or not.
(regex_compile): Use `analyse_first' to decide whether the loop-check
needs to be done or not for *, +, *? and +? (the loop check is costly
for non-greedy repetition).
(re_compile_fastmap): Delegate the actual work to `analyse_first'.

ISO-DATE.  If non-nil, return date in ISO 8601 format.

(enum re_opcode_t): Update description of succeed_n.
(PATFETCH): Always define.
(regex_compile): Use lookahead rather than PATUNFETCH (for repetition
operators, char classes, shy-groups and intervals).
Optimize special cases of intervals so as to only use succeed_n and
jump_n when really needed.
(re_compile_fastmap): Simplify handling of jump_n and succeed_n now
that we don't have to handle the special cases any more.
Simplify on_failure_jump handling as well.

(Vw32_charset_to_codepage_alist): Removed.
(Vw32_charset_info_alist): New variable.
(Qw32_charset_[ansi, default, symbol, shiftjis, hangul, gb2312,
chinesebig5, oem, easteurope, turkish, baltic, russian, arabic,
greek, hebrew, thai, johab, mac, unicode]): New symbols.
(x_produce_glyphs): Remove out of date #ifdef 0'd section. Replace
with TODO comment.
(w32_codepage_for_font): Use Vw32_charset_info_alist.
(syms_of_w32term): Remove Vw32_charset_to_codepage_alist.
Define Vw32_charset_info_alist and w32_charset symbols.

(mark_memory): Use it.
(SETJMP_WILL_LIKELY_WORK, SETJMP_WILL_NOT_WORK): New macros.
(setjmp_tested_p, longjmp_done): New variables.
(test_setjmp): New function.
(mark_stack) [!GC_SETJMP_WORKS]: Call test_setjmp.
(init_alloc): Initialize setjmp_tested_p and longjmp_done.

to DEC_TEXT_POS and INC_TEXT_POS.

with parameter MULTIBYTE_P.

buffers because it looks for multibyte character sequences which
don't exist in unibyte text.

(x_alloc_nearest_color) [DEBUG_X_COLORS]: Call register_color.

[DEBUG_X_COLORS]: New functions.
(x_free_colors) [DEBUG_X_COLORS]: Unregister colors.

instead of MAX_BUFFER_LOCAL_VARS.
(last_per_buffer_idx): Renamed from max_buffer_local_idx.

for handling per-buffer variables.

(PER_BUFFER_VAR_OFFSET): Renamed from BUFFER_LOCAL_VAR_OFFSET.
(PER_BUFFER_VAR_IDX): Renamed from BUFFER_LOCAL_VAR_IDX.
(PER_BUFFER_VALUE_P): Renamed from BUFFER_HAS_LOCAL_VALUE_P.
(SET_PER_BUFFER_VALUE_P): Renamed from SET_BUFFER_HAS_LOCAL_VALUE_P.
(PER_BUFFER_IDX): Renamed from BUFFER_LOCAL_IDX.
(PER_BUFFER_DEFAULT): Renamed from BUFFER_LOCAL_DEFAULT_VALUE.
(PER_BUFFER_VALUE): Renamed from BUFFER_LOCAL_VALUE.
(PER_BUFFER_SYMBOL): Renamed from BUFFER_LOCAL_SYMBOL.
(PER_BUFFER_TYPE): Renamed from BUFFER_LOCAL_TYPE.

(x_set_cursor_type): Use it.

(print_partial_compiled_pattern, re_compile_fastmap): Handle new opcode.
(regex_compile): Use on_failure_jump_nastyloop for non-greedy loops.
(re_match_2_internal): Add code for on_failure_jump_nastyloop when
executing it as well as when popping it off the stack to find infinite
loops in non-greedy repetition operators.

if it ever becomes used.
(log-edit-mode-hook): Default to vc-log-mode-hook.
(log-edit-mode): Fix the docstring.

(syms_of_doc): Initialize Qfunction_documentation.
(Fdocumentation): If FUNCTION is a symbol with non-nil
`function-documentation' property, return a documentation derived
from that.

(init_buffer_once): Don't let cursor_type have a local value
in every buffer.