patch-shebang and Rust - Change on core-updates?

[Danny Milosavljevic <dannym@scratchpost.org>]

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Hi,

Rust uses #![...] for something that is definitely not a shebang
(file-wide feature tests).

Currently, our patch-shebang[1] emits a lot of warnings because of those.

Should we change patch-shebang to ignore lines starting with "#![" ?

If so, how?  There's some get-char* magic that I don't understand.

The easiest way would be to add peek-char after the two calls to get-char*,
but not sure if that would work.

Alternatively, we could adapt the regexp.

>(define patch-shebang
>  (let ((shebang-rx (make-regexp "^[[:blank:]]*([[:graph:]]+)[[:blank:]]*([[:graph:]]*)(.*)$")))

The [[:graph:]]+ would have to change to something like 

  [[:graph-without-opening-bracket:]][[:graph:]]+

[1] ./guix/build/utils.scm patch-shebang

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