if let Some(expr) = expr {
unpack!(block = this.into(destination, block, expr));
} else {
+ // If a block has no trailing expression, then it is given an implicit return type.
+ // This return type is usually `()`, unless the block is diverging, in which case the
+ // return type is `!`. For the unit type, we need to actually return the unit, but in
+ // the case of `!`, no return value is required, as the block will never return.
let tcx = this.hir.tcx();
let ty = destination.ty(&this.local_decls, tcx).to_ty(tcx);
if ty.is_nil() {
-// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//