Nothing
Code
set_state_inspector(function(x) 123)
Condition
Error in `set_state_inspector()`:
! `callback` must be a zero-arg function, or NULL
[ FAIL 0 | WARN 1 | SKIP 0 | PASS 1 ]
== Warnings ====================================================================
-- Warning ('reporters/state-change.R:1:1'): options ---------------------------
Global state has changed:
`before$x` is NULL
`after$x` is a double vector (1)
[ FAIL 0 | WARN 1 | SKIP 0 | PASS 1 ]
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