Replaced implementation of concat.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2018-12-02 13:04:16
Author local date 2018-12-02 14:04:16 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2018-12-02 13:04:16
Committer local date 2018-12-02 14:04:16 +0100
Commit 57b773fb85e940477a405e40c15ed76d6e6a5722
Tree 0a7ffd8879c0aa2874d0bf1f3a4d62004525dcc3
Parent 953813ae0dede3ae117b8f06411c606fef6f10c9
Replaced implementation of concat.
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