error: this union has the default representation
  --> $DIR/default_union_representation.rs:4:1
   |
LL | / union NoAttribute {
LL | |
LL | |     a: i32,
LL | |     b: u32,
LL | | }
   | |_^
   |
   = help: consider annotating `NoAttribute` with `#[repr(C)]` to explicitly specify memory layout
   = note: `-D clippy::default-union-representation` implied by `-D warnings`

error: this union has the default representation
  --> $DIR/default_union_representation.rs:17:1
   |
LL | / union ReprPacked {
LL | |
LL | |     a: i32,
LL | |     b: u32,
LL | | }
   | |_^
   |
   = help: consider annotating `ReprPacked` with `#[repr(C)]` to explicitly specify memory layout

error: this union has the default representation
  --> $DIR/default_union_representation.rs:36:1
   |
LL | / union ReprAlign {
LL | |
LL | |     a: i32,
LL | |     b: u32,
LL | | }
   | |_^
   |
   = help: consider annotating `ReprAlign` with `#[repr(C)]` to explicitly specify memory layout

error: this union has the default representation
  --> $DIR/default_union_representation.rs:57:1
   |
LL | / union ZSTAndTwoFields {
LL | |
LL | |     f0: u32,
LL | |     f1: u64,
LL | |     f2: (),
LL | | }
   | |_^
   |
   = help: consider annotating `ZSTAndTwoFields` with `#[repr(C)]` to explicitly specify memory layout

error: aborting due to 4 previous errors