In reply to @pennae:matrix.eno.space
currently playing around with a mkDerivation' :: (Attrs -> Attrs) -> Attrs -> Drv. could be useful to solve eg the rust overrideAttrs problem (where rust would use mkDerivation' to do rust-specific processing to the args before passing them on, and regular mkDerivation would just pass id). is this something? is there something other than stdenv adapters that could turn into a problem?

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+ exitHandler
+ exitCode=226
+ set +e
+ '[' -n '' ']'
+ ((  226 != 0  ))
+ runHook failureHook
+ local hookName=failureHook
+ shift
+ local 'hooksSlice=failureHooks[@]'
+ local hook
+ for hook in "_callImplicitHook 0 $hookName" ${!hooksSlice+"${!hooksSlice}"}
+ _eval '_callImplicitHook 0 failureHook'
+ declare -F '_callImplicitHook 0 failureHook'
+ eval '_callImplicitHook 0 failureHook'
++ _callImplicitHook 0 failureHook
++ local def=0
++ local hookName=failureHook
++ declare -F failureHook
++ type -p failureHook
++ '[' -n '' ']'
++ return 0
+ return 0
+ '[' -n '' ']'
+ return 226
   Compiling proc-macro2 v1.0.43

trap "exitHandler" EXIT

If a sigspec is 0 or EXIT, arg is executed when the shell exits.