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-rw-r--r--tools/samtools-faidx.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/samtools-faidx.nix b/tools/samtools-faidx.nix
index bf32bdf..1fde411 100644
--- a/tools/samtools-faidx.nix
+++ b/tools/samtools-faidx.nix
@@ -7,6 +7,9 @@ input:
with nixpkgs;
with lib;
+with bionix.types;
+
+assert (matchFiletype "samtools-faidx" { fa = _: true; } input);
stdenv.mkDerivation {