error: struct literals are not allowed here
  --> $DIR/struct-literal-in-while.rs:12:11
   |
LL |       while Foo {
   |  ___________^
LL | |         x: 3
LL | |     }.hi() {
   | |_____^
   |
help: surround the struct literal with parentheses
   |
LL |     while (Foo {
LL |         x: 3
LL |     }).hi() {
   |

error: aborting due to previous error