Resolving dependencies...
Build profile: -w ghc-9.2.4 -O0
In order, the following will be built (use -v for more details):
 - demangler-1.2.0.0 (first run)
Configuring demangler-1.2.0.0...
Warning: 'ghc-options: -threaded' has no effect for libraries. It should only
be used for executables.
Preprocessing library for demangler-1.2.0.0..
Building library for demangler-1.2.0.0..
[1 of 6] Compiling Demangler.Context
[2 of 6] Compiling Demangler.Structure
[3 of 6] Compiling Demangler.Engine
[4 of 6] Compiling Demangler.PPrint
[5 of 6] Compiling Demangler.Substitution

src/Demangler/Substitution.hs:41:1: warning: [-Wunused-imports]
    The import of Demangler.Context is redundant
      except perhaps to import instances from Demangler.Context
    To import instances alone, use: import Demangler.Context()
   |
41 | import           Demangler.Context
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[6 of 6] Compiling Demangler

src/Demangler.hs:329:1: warning: [-Wunused-top-binds]
    Defined but not used: closure_prefix
    |
329 | closure_prefix = tbd "closure prefix"
    | ^^^^^^^^^^^^^^
Preprocessing executable 'demangle' for demangler-1.2.0.0..
Building executable 'demangle' for demangler-1.2.0.0..
[1 of 1] Compiling Main
Linking /home/builder/builder-dir/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.2.4/demangler-1.2.0.0/noopt/build/demangle/demangle ...
Preprocessing test suite 'demangler-test' for demangler-1.2.0.0..
Building test suite 'demangler-test' for demangler-1.2.0.0..
[1 of 1] Compiling Main
Linking /home/builder/builder-dir/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.2.4/demangler-1.2.0.0/noopt/build/demangler-test/demangler-test ...
Running 1 test suites...
Test suite demangler-test: RUNNING...
Test suite demangler-test: FAIL
Test suite logged to:
/home/builder/builder-dir/build-cache/tmp-install/reports/demangler-1.2.0.0.test
Writing: demangler-1.2.0.0-inplace/Demangler.hs.html
Writing: hpc_index.html
Writing: hpc_index_fun.html
Writing: hpc_index_alt.html
Writing: hpc_index_exp.html
Test coverage report written to
/home/builder/builder-dir/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.2.4/demangler-1.2.0.0/noopt/hpc/vanilla/html/demangler-test/hpc_index.html
0 of 1 test suites (0 of 1 test cases) passed.
Writing: demangler-1.2.0.0-inplace/Demangler.hs.html
Writing: hpc_index.html
Writing: hpc_index_fun.html
Writing: hpc_index_alt.html
Writing: hpc_index_exp.html
Package coverage report written to
/home/builder/builder-dir/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.2.4/demangler-1.2.0.0/noopt/hpc/vanilla/html/demangler-1.2.0.0/hpc_index.html
Error: cabal: Tests failed for demangler-1.2.0.0.