error: variable `A` should have a snake case name
  --> $DIR/forbid-group-group-1.rs:11:9
   |
LL |     let A: ();
   |         ^ help: convert the identifier to snake case: `a`
   |
note: the lint level is defined here
  --> $DIR/forbid-group-group-1.rs:4:11
   |
LL | #![forbid(nonstandard_style)]
   |           ^^^^^^^^^^^^^^^^^
   = note: `#[forbid(non_snake_case)]` implied by `#[forbid(nonstandard_style)]`

error: aborting due to 1 previous error