Function tuple_struct 

pub fn tuple_struct(
    name: GeneratedToken,
    parameters: Vec<Vec<GeneratedToken>>,
    fields: Vec<Vec<GeneratedToken>>,
    predicates: Vec<Vec<GeneratedToken>>,
) -> Result<Vec<GeneratedToken>, Overflow>

One tuple struct struct Name<...>(fields) where ...;.

A single field is a newtype, and a PhantomData<T> field is an ordinary caller-owned type fragment rather than another projector concept.

Errors

Returns Overflow where the field group outgrows the declared generated-token magnitude.