error[E0452]: malformed lint attribute input
  --> $DIR/E0452.rs:1:10
   |
LL | #![allow(foo = "")]
   |          ^^^^^^^^ bad attribute argument

error[E0452]: malformed lint attribute input
  --> $DIR/E0452.rs:1:10
   |
LL | #![allow(foo = "")]
   |          ^^^^^^^^ bad attribute argument
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error[E0452]: malformed lint attribute input
  --> $DIR/E0452.rs:1:10
   |
LL | #![allow(foo = "")]
   |          ^^^^^^^^ bad attribute argument
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error[E0452]: malformed lint attribute input
  --> $DIR/E0452.rs:1:10
   |
LL | #![allow(foo = "")]
   |          ^^^^^^^^ bad attribute argument
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0452`.