nasm 0 -> 1
attrpath: nasm
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] 
Going to be running update for following packages:
 - nasm-2.16.02

Press Enter key to continue...
Running update for:
 - nasm-2.16.02: UPDATING ...
 - nasm-2.16.02: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/compilers/nasm/default.nix b/pkgs/development/compilers/nasm/default.nix
index 64abd3a1e322..a55c51f6e488 100644
--- a/pkgs/development/compilers/nasm/default.nix
+++ b/pkgs/development/compilers/nasm/default.nix
@@ -7,11 +7,11 @@
 
 stdenv.mkDerivation rec {
   pname = "nasm";
-  version = "2.16.02";
+  version = "2.16.03";
 
   src = fetchurl {
     url = "https://www.nasm.us/pub/nasm/releasebuilds/${version}/${pname}-${version}.tar.xz";
-    sha256 = "sha256-HhuULqiPIu2uiWWeFb4m+gJ+rgdH9RQTVA9S1OrEeQ0=";
+    sha256 = "sha256-FBKhx2C70F2wJrbA0WV6/9ZjHNCmPN229zzG1KphYUg=";
   };
 
   nativeBuildInputs = [ perl ];

No auto update branch exists
Old version 2.16.02" not present in staging derivation file with contents: { lib
, stdenv
, fetchurl
, perl
, gitUpdater
}:

stdenv.mkDerivation rec {
  pname = "nasm";
  version = "2.16.03";

  src = fetchurl {
    url = "https://www.nasm.us/pub/nasm/releasebuilds/${version}/${pname}-${version}.tar.xz";
    hash = "sha256-FBKhx2C70F2wJrbA0WV6/9ZjHNCmPN229zzG1KphYUg=";
  };

  nativeBuildInputs = [ perl ];

  enableParallelBuilding = true;

  doCheck = true;

  checkPhase = ''
    runHook preCheck

    make golden
    make test

    runHook postCheck
  '';

  passthru.updateScript = gitUpdater {
    url = "https://github.com/netwide-assembler/nasm.git";
    rev-prefix = "nasm-";
    ignoredVersions = "rc.*";
  };

  meta = with lib; {
    homepage = "https://www.nasm.us/";
    description = "An 80x86 and x86-64 assembler designed for portability and modularity";
    platforms = platforms.unix;
    maintainers = with maintainers; [ pSub willibutz ];
    license = licenses.bsd2;
  };
}