Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [Failed Tests (2):
  Clang :: CodeGen/SystemZ/unaligned-symbols.c
  Clang :: Interpreter/cxx20-modules.cppm]: [Multiple tests have failed.]

Issue: Unit tests have failed during build.
Resolution: Ensure that all tests are passing before initializing build again.