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(Ftranslate_region_internal, Fformat):
Rename or remove local vars to avoid shadowing.

(Fuser_real_uid, Fuser_full_name): Remove unnecessary casts,
some of which prompt warnings from gcc -Wbad-function-cast.

avoid shadowing.

variables as initialized.

ENABLE_CHECKING is not defined.

gcc -Wbad-function-cast warning.

! defined SYSTEM_MALLOC && ! defined SYNC_INPUT, as they are not
needed otherwise.
(CHECK_ALLOCATED): Define only if GC_CHECK_MARKED_OBJECTS.
(GC_STRING_CHARS): Remove; not used.

they're used.

Rename locals to avoid shadowing.

* lisp.h (check_cons_list): Declare if GC_CHECK_CONS_LIST; this
avoids undefined behavior in theory.

the race-condition problem the old DOWNCASE.

(WORDCHAR_P): Likewise.  This one is never needed, but is used
only in a comment talking about a compiler bug, so put inside
the #if 0 of that comment.
(CHARSET_LOOKUP_BITMAP, FAIL_STACK_FULL, RESET_FAIL_STACK):
(PUSH_FAILURE_ELT, BUF_PUSH_3, STOP_ADDR_VSTRING):
Remove; unused.

which gcc can warn about.

Remove unused local vars.

Rename locals to avoid shadowing.
(regex_compile, re_match_2_internal): Move locals to avoid shadowing.

* character.h (FETCH_STRING_CHAR_AS_MULTIBYTE_ADVANCE): Likewise.

* lisp.h: ... to here, so that it can be checked.
(struct re_registers): New forward decl.

All uses changed.
(MULTIBYTE_BYTES_WIDTH, scan_for_column, compute_motion):
Rename locals to avoid shadowing.