Collapse multiple blocks in closures
Collapse multiple blocks in closures

Fixes #1524

aidancully/rust,SingingTree/rustfmt,graydon/rust,rust-lang/rustfmt,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,SingingTree/rustfmt,rust-lang/rustfmt