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comparing pointers.

(Ffind_coding_systems_region_internal): First argument to Fappend must be an
integer, not a lisp object.

of the clip area when image doesn't have a mask.

tables out of the list of all weak hash tables.

new buffer is created, make sure make sure echo_area_buffer[]
references the new buffer.

(Fmake_hash_table, amke_hash_table): Allow table size of 0.

  NEW_POS (they were pretty screwed up before).

using alloca; free it after run_msdos_command returns

Fconstrain_to_field.