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Re-enabling native-comp surfaced a suite-wide fragility. When a test redefines a C primitive (or a native-compiled function), native-comp routes native callers through a trampoline that calls the mock with the primitive's maximum arity. A fixed-arity mock narrower than the primitive then throws wrong-number-of-arguments, intermittently, as the eln-cache fills.
I swept every arity-narrow subr mock to append &rest _ (188 sites, preserving any named args the body uses), and added tests/test-meta-subr-mock-arity.el, which fails make test on any subr mock too narrow for the primitive's arity. The rule isn't "never mock a subr". The suite mocks message and completing-read freely. It's "a subr mock must accept the primitive's arity."
Background, the three failure modes, and the research are in docs/native-comp-subr-mocking.org.
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`S` ("study") in `dirvish-mode-map` opens the `.org` file at point and runs `cj/drill-this-file` on it, so I can drill any deck straight from the file list. It `user-error`s on no file, on a directory, or on a non-`.org` file.
`D` and `O` were already taken (duplicate-file, open-with-command), so I went with `S`. It shadows dired's `dired-do-symlink`, which I never use from dirvish and which stays on `M-x` anyway. New `tests/test-dirvish-config-drill.el`: 6 ERT tests with `dired-get-filename`, `find-file`, and `cj/drill-this-file` mocked. I also fixed the stale `P` line in the module commentary — `P` is the print command now, not copy-path.
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