A structure-literal syntax was used to create an item that is not a structure or enum variant.

Example of erroneous code:

type U32 = u32;
let t = U32 { value: 4 }; // error: expected struct, variant or union type,
                          // found builtin type `u32`

To fix this, ensure that the name was correctly spelled, and that the correct form of initializer was used.

For example, the code above can be fixed to:

type U32 = u32;
let t: U32 = 4;

or:

struct U32 { value: u32 }
let t = U32 { value: 4 };