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9f6841c37e
The bug is that "$*", and related expansions such as "${arr[*]}",
etc., do pattern matching if the first character of $IFS is a
wildcard. For example, the following:
IFS=*
set -- F ''
case BUGFREE in
BUG"$*") echo bug ;;
esac
outputs 'bug'. This bug can be reproduced in every other glob
pattern matching context as well, but not in pathname expansion.
src/cmd/ksh93/sh/macro.c: varsub():
- When joining fields into one for a "$*"-type expansion, check if
a glob pattern matching operation follows (mp->pattern is set).
If so, write a preceding backslash to escape the separator.
Resolves: https://github.com/ksh93/ksh/issues/489
Resolves: https://github.com/att/ast/issues/12
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