$ grep -r "is_plain_hashref(" .cpan/build/Ref-Util-0.204-0/t/*.t
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:                is_plain_hashref($value),
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:                "is_plain_hashref($plain_type) is true",
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:                !is_plain_hashref($value),
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:                "is_plain_hashref($plain_type) is false",
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:            !is_plain_hashref($value),
.cpan/build/Ref-Util-0.204-0/t/all-permutations.t:            "is_plain_hashref($blessed_type) is false",
.cpan/build/Ref-Util-0.204-0/t/functions.t:            is_plain_hashref     => is_plain_hashref($value),
.cpan/build/Ref-Util-0.204-0/t/magic-readonly.t:ok( is_plain_hashref($rh2), 'They are not plain!' );