~str
find src -name '*.rs' | xargs sed -i '' 's/~~~.*{\.rust}/```rust/g' find src -name '*.rs' | xargs sed -i '' 's/ ~~~$/ ```/g' find src -name '*.rs' | xargs sed -i '' 's/^~~~$/ ```/g'
common supertypes. This was breaking with the change to regions because of the (now incorrect) assumpton that our inference code makes, which is that if a <: b succeeds, there is no need to compute the LUB/GLB.