Error code E0422
An identifier that is neither defined nor a struct was used.
Erroneous code example:
fn main () { let x = Foo { x: 1, y: 2 }; }
In this case, Foo
is undefined, so it inherently isn't anything, and
definitely not a struct.
fn main () { let foo = 1; let x = foo { x: 1, y: 2 }; }
In this case, foo
is defined, but is not a struct, so Rust can't use it as
one.