Click library partially broken

The click command getchar() is broken. There are only three commands within click for getting user inputs,
- click.prompt('example text, enter something') which works
- click.getchar() which throws a runtime error "generator didn't yield"
- click.pause('example text, hit any key') which throws a runtime error "generator didn't yield"

Easily reproduced error, simply type the following.

$ python
$ import click
$ x = click.getchar()

Traceback (most recent call last)
File ....termui.py line 769, in getchar
File ..._termui_impl.py line 711, in getchar
File ...contextlib.py line 121, in __enter__
raise RuntimeError("generator didn't yield") from None