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test('T1969',
     [# expect_broken(12437),
      collect_compiler_residency(20),
      collect_compiler_stats('bytes allocated', 1),
      only_ways(['normal']),

      extra_hc_opts('-dcore-lint -static'),
          # Leave -dcore-lint on for this one test, so that we have something
          # that will catch a regression in -dcore-lint performance.
     ],
     compile,
     [''])

Here the line extra_hc_opts(...) overrides extra hc opts set by collect_compier_residency:

RESIDENCY_OPTS = '+RTS -A256k -i0 -h -RTS'

def collect_compiler_residency(tolerance_pct: float):
    return [
        collect_compiler_stats(['peak_megabytes_allocated', 'max_bytes_used'], tolerance_pct),
        extra_hc_opts(RESIDENCY_OPTS),
        # The nonmoving collector does not support -G1
        omit_ways([WayName('nonmoving_thr_ghc')])
    ]

As a result we don't pass -A256k -i0 -h when building this test, and max residency numbers are very unstable.