Specification 9.1.12 substitutes `RUN` for `CL`.

[python-processing-unit]

According to the specification section 9.1.12:

• INT: SHUSH() = MUST suppress forwarding of console output produced by operators such as PRINT, WARN, and shell-output capture from CL, while leaving the corresponding I/O events available for deterministic logging and replay. INPUT prompts MUST continue to be forwarded while shushing is active. RUN MUST temporarily disable shushing for the duration of the executed source. SHUSH MUST return 0.

However, RUN MUST NOT disable SHUSH. CL MUST disable SHUSH.

Prefix REPL. Enter statements, blank line to run buffer.
>>> SHUSH()
>>> CL("echo foo")
>>>

[python-processing-unit]

Revision: Do not temporarily disable shushing for the duration of anything.