error[E0277]: a `try` block must return `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-block-in-while.rs:6:17
   |
LL |     while try { false } {}
   |                 ^^^^^ could not wrap the final value of the block as `bool` doesn't implement `Try`
   |
   = help: the trait `Try` is not implemented for `bool`
note: required by `from_output`
  --> $SRC_DIR/core/src/ops/try_trait.rs:LL:COL
   |
LL |     fn from_output(output: Self::Output) -> Self;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.