error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `a`
  --> $DIR/while-loop.rs:2:12
   |
LL |     whilee a < b {
   |            ^ expected one of 8 possible tokens
   |
help: there is a keyword `while` with a similar name
   |
LL |     while a < b {
   |     ~~~~~

error: aborting due to 1 previous error