monostate 1.0.2

Type that deserializes only from one specific value
Documentation 
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error: unsupported monostate literal kind
 --> tests/ui/float.rs:4:21
  |
4 |     let _ = MustBe!(1.0);
  |                     ^^^

error: unsupported monostate literal kind
 --> tests/ui/float.rs:5:21
  |
5 |     let _ = MustBe!(b"...");
  |                     ^^^^^^

error: unsupported monostate literal kind
 --> tests/ui/float.rs:6:21
  |
6 |     let _ = MustBe!(c"...");
  |                     ^^^^^^