bors 05c300144c Auto merge of #82440 - ssomers:btree_fix_casts, r=Mark-Simulacrum
BTree: no longer define impossible casts

Casts to leaf to internal only make sense when the original has a chance of being the thing it's cast to.

r? `@Mark-Simulacrum`
2021-03-01 05:39:01 +00:00
..