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#### Note: this error code is no longer emitted by the compiler.
An `if let` pattern attempts to match the pattern, and enters the body if the
match was successful. If the match is irrefutable (when it cannot fail to
match), use a regular `let`-binding instead. For instance:
```
struct Irrefutable(i32);
let irr = Irrefutable(0);
// This fails to compile because the match is irrefutable.
if let Irrefutable(x) = irr {
// This body will always be executed.
// ...
}
```
Try this instead:
```
struct Irrefutable(i32);
let irr = Irrefutable(0);
let Irrefutable(x) = irr;
println!("{}", x);
```
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