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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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Sibling tests cover the move/rename/copy/clear family. The remaining helpers and dispatchers were uncovered:
- `cj/print--resolve-spooler`: explicit-string on PATH, explicit-string missing (error), `auto` prefers lpr, `auto` falls back to lp, `auto` with nothing on PATH (error), `auto` returns cached value, invalid spooler symbol (error).
- `cj/copy-buffer-name`: places the current buffer's name on the kill ring with a confirmation message.
- `cj/view-buffer-in-eww`: hands the file off to `eww-open-file` when visiting a file, errors otherwise.
- `cj/--email-handle-is-type-p`: prefix-matches content-types, handles nil handle without signaling.
- `cj/--diff-with-regular-diff`: writes a unified diff into the target buffer with header + diff output.
- `cj/diff-buffer-with-file`: errors when not visiting a file, messages "No differences" when diff -q returns 0.
16 new tests total. `call-process`, `executable-find`, `eww-open-file`, `mm-handle-type`, `diff-mode` are stubbed.
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