Bogus unrelated --explain text for "error[E0507]: cannot move out of captured outer variable in an Fn closure"

[insaneinside]

rustc --explain E0507 prints a message which apparently discusses "error[E0507]: cannot move out of borrowed content":

You tried to move out of a value which was borrowed. ...

(That's funny, because the error said I tried to "move out of captured outer variable in an Fn closure".)

• If "cannot move out of captured outer variable in an Fn closure" really is the same error, this should be explained in the --explain text.
• If it is not the same error, it should have its own error code and explanation.

[insaneinside]

related: #37150, #31752

I understand how this is a borrow error, but IMHO it would be better for casual users if it had its own explanation because the diagnostic's message is so different.