hash.c (linear_copy): solve two issues on Hash#replace.
(1) fix memory leak
(1-1) don't allocate memory if destination already
has a memory area.
(1-2) free destination memory if src is NULL.
(2) clear transient heap flag if src is NULL. [Bug #15358]
Added by ko1 (Koichi Sasada) over 5 years ago
clear dst Hash on Hash#replace. [Bug #15358]
Hash#replace.(1) fix memory leak
(1-1) don't allocate memory if destination already
has a memory area.
(1-2) free destination memory if src is NULL.
(2) clear transient heap flag if src is NULL. [Bug #15358]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e