Bug#1064470: barfs on superfluous environment variable

[Zefram]

Package: rakudo
Version: 2020.12+dfsg-1
Severity: normal

Here's an invocation of raku(1) to perform a trivial action:

$ raku -e 'say "hi"'
hi
$

And here's the same invocation with an irrelevant environment variable
added:

$ A=$'\xcc\x81'
$ for p in 0 1 2 3 4 5 6 7 8 9; do A=$A$A; done
$ export A
$ raku -e 'say "hi"'
Unhandled exception: Too many codepoints (1025) in grapheme
   at src/vm/moar/ModuleLoader.nqp:11  (/usr/share/nqp/lib/ModuleLoader.moarvm:search_path)
 from src/vm/moar/ModuleLoader.nqp:133  (/usr/share/nqp/lib/ModuleLoader.moarvm:)
 from src/vm/moar/ModuleLoader.nqp:130  (/usr/share/nqp/lib/ModuleLoader.moarvm:load_setting)
 from <unknown>:1  (/usr/lib/perl6/runtime/perl6.moarvm:<dependencies+deserialize>)
$

raku(1) should not be failing because of an environment variable that
isn't controlling anything and isn't being referenced.

-zefram