nixpkgs/pkgs/build-support/safe-discard-string-context.nix

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# | Discard the context of a string while ensuring that expected path
# validity invariants hold.
#
# This relies on import-from-derivation, but it is only useful in
# contexts where the string is going to be used in an
# import-from-derivation anyway.
#
# safeDiscardStringContext : String → String
{ writeText }: s:
builtins.seq
(import (writeText
"discard.nix"
"${builtins.substring 0 0 s}null\n"))
(builtins.unsafeDiscardStringContext s)