ghc-debug-stub fails to build in nightly run

Job #1204057 failed for head.hackage@2a556f25:

Building library for ghc-debug-stub-0.2.1.0..
[1 of 1] Compiling GHC.Debug.Stub   ( src/GHC/Debug/Stub.hs, dist/build/GHC/Debug/Stub.o, dist/build/GHC/Debug/Stub.dyn_o )
cbits/stub.cpp: In function ‘int handle_command(Socket&, const char*, uint32_t)’:
cbits/stub.cpp:605:31: error:
     error: ‘InfoProv’ {aka ‘struct InfoProv_’} has no member named ‘srcloc’
      605 |         write_string(resp, ip.srcloc);
          |                               ^~~~~~
    |
605 |         write_string(resp, ip.srcloc);
    |                               ^
`g++' failed in phase `C++ Compiler'. (Exit code: 1)

[sic]