first implementation, half of the tests succeed
need to call duplicate() occasionally to make the tests work
mocking imported functions now works!
not patching package environment anymore
cleanup
only need to mock in one environment at a time
remove debugging artifact
reformat error message
remove caveat
update docs
use explicit function import instead of registration -- this is checked at build time
test restoring of mocked function on error
update description of implementation detail
refactor: extract mock constructor
inline reassign_function
rename C_reassign_function to reassign_function
inline duplicate function, avoid using it in tests
rename C_duplicate to duplicate_
pass env to envir parameter and not to pos parameter of get()
store result of as.name() in mock object