Since when `{...}' syntax is a glob pattern? What does `{a,b}/c' produce when there is no directory named `a'?
Since glibc (better to say csh) implemented it. https://man7.org/linux/man-pages/man3/glob.3.html search for GLOB_BRACE
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Since when `{...}' syntax is a glob pattern? What does `{a,b}/c' produce when there is no directory named `a'?