A struct pattern attempted to extract a non-existent field from a struct.
Erroneous code example:
```compile_fail,E0026
struct Thing {
x: u32,
y: u32,
}
let thing = Thing { x: 0, y: 0 };
match thing {
Thing { x, z } => {} // error: `Thing::z` field doesn't exist
}
```
If you are using shorthand field patterns but want to refer to the struct field
by a different name, you should rename it explicitly. Struct fields are
identified by the name used before the colon `:` so struct patterns should
resemble the declaration of the struct type being matched.
```
struct Thing {
x: u32,
y: u32,
}
let thing = Thing { x: 0, y: 0 };
match thing {
Thing { x, y: z } => {} // we renamed `y` to `z`
}
```