Shrink `ObligationCauseCode` - #64302

Merged

bors merged 4 commits into

rust-lang:masterfrom

nnethercote:shrink-ObligationCauseCode

Sep 14, 2019

Commits on Sep 8, 2019

Remove two unnecessary `clone()` calls.
nnethercote
committed
36b37e2

Commits on Sep 9, 2019

Add some assertions on obligation type sizes.
nnethercote
committed
c1b9a46
Shrink `ObligationCauseCode` by boxing `MatchExpressionArm`.
nnethercote
committed
b972ac8
Shrink `ObligationCauseCode` by boxing `IfExpression`.
nnethercote
committed
2e3b079