implicitTypePos.lean:1:8-1:9: error: Failed to infer type of binder `y`
implicitTypePos.lean:1:6-1:7: error: Failed to infer type of binder `x`
implicitTypePos.lean:3:9-3:10: error: Failed to infer type of binder `y`
implicitTypePos.lean:5:9-5:10: error: Failed to infer type of binder `β`
implicitTypePos.lean:7:10-7:11: error: Failed to infer type of binder `β`