expand: do not panic on extglob nodes

mvdan / sh

A shell parser, formatter, and interpreter with bash support; includes shfmt

https://pkg.go.dev/mvdan.cc/sh/v3

BSD 3-Clause "New" or "Revised" License

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Closed riacataquian closed 2 years ago

riacataquian commented 2 years ago

we currently don't support bash's extglob option and when attempted, interp panics

fix expand so that we return the error properly and exit with status 1

fixes #841