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Stops if:
x is not a list
x is a data.frame
x has no names
x has any NA names
x has any zero-length names
x has any whitespace-only names
assert_named_list(x)
[none] stop if assertion fails
[list] List to check
Other assertions: assert_dir_exists(), assert_scalar(), assert_scalar_not_empty(), assert_type()
assert_dir_exists()
assert_scalar()
assert_scalar_not_empty()
assert_type()