Follow-up Comment #4, bug #29820 (project grep):

> $ /bin/echo achb | LC_ALL=es_US.iso88591 src/grep 'a[[.ch.]]b'
> src/grep: Invalid collation character

This is a bug in glibc.  You can work around it with

$ /bin/echo achb | LC_ALL=es_US.iso88591 src/grep 'a[[.c-h.]]b'

> $ /bin/echo achb | LC_ALL=en_US.UTF-8 src/grep 'a[[.ch.]]b'
> Segmentation fault (core dumped)
> (expected compile-error)

Seems to be fixed now.

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