Run of scrub-obsolete for llvm-toolchain-11

Try this locally (using the lintian-brush package):

debcheckout llvm-toolchain-11
cd llvm-toolchain-11
deb-scrub-obsolete
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Looking for a way to retrieve the upstream tarball
Looking for upstream tarball in local branch.
Using pristine-tar to reconstruct llvm-toolchain-11/11.1.0.
Searching for revision importing llvm-toolchain-11 version 11.1.0 on packaging branch.
Using apt to look for the upstream tarball.
apt could not find llvm-toolchain-11/11.1.0.
Using uscan to look for the upstream tarball.
uscan warn: In debian/watch no matching hrefs for version 11.1.0 in watch line
  https://llvm.org/releases/download.html .*/llvm-([\d\.\-]+).src.tar.xz
Looking for upstream llvm-toolchain-11/11.1.0 in upstream branch <LocalGitBranch('file:///home/janitor/tmp/tmp7kybpr7k/llvm-toolchain-11/', 'master')>.
No upstream upstream-revision format specified, trying tag:11.1.0
No upstream upstream-revision format specified, trying tag:llvm-toolchain-11-11.1.0
No upstream upstream-revision format specified, trying tag:v11.1.0
No upstream upstream-revision format specified, trying tag:v.11.1.0
brz: ERROR: Unable to find the needed upstream tarball for package llvm-toolchain-11, version 11.1.0.

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