You know what grinds my gears?

When CCL detects that it's running under comint and for some reason threading capability goes poof.

? (find-symbol "process-run-function")
NIL
NIL

You gotta be shitting me. It works fine when I launch it manually.

Get out Kimmo Alm.

Result I get in Clozure 1.4 on Win32:

? (find-symbol "PROCESS-RUN-FUNCTION")
PROCESS-RUN-FUNCTION
:INHERITED
? (symbol-package *)
#<Package "CCL">
Make sure you use "PROCESS-RUN-FUNCTION" when searching, as it searches for the symbol name, which will be upcase depending on the readtable that was used when reading said system library code. Disregard what I said if you actually recompiled CCL with readtable-case equal to something other than :upcase.

One more thing, features like threading are usually too fundamental to disappear at runtime, they're usually determined at compile-time. Check your *features*.

You're right, thanks. Goddamned default upcasing.

? (find-symbol "PROCESS-RUN-FUNCTION")
PROCESS-RUN-FUNCTION
:INHERITED