error: digits grouped inconsistently by underscores
  --> $DIR/test.rs:18:18
   |
LL |     let _fail1 = 100_200_300.123456789;
   |                  ^^^^^^^^^^^^^^^^^^^^^ help: consider: `100_200_300.123_456_789`
   |
   = note: `-D clippy::inconsistent-digit-grouping` implied by `-D warnings`

error: aborting due to previous error