traitful 0.3.0

A collection of helper macros for trait patterns
Documentation 
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use syn::{
    punctuated::Punctuated, Expr, ExprPath, GenericArgument, GenericParam,
    Path, PathArguments, PathSegment, Type, TypePath,
};

/// Create a generic argument from a generic parameter.
pub(crate) fn generic_arg(generic_param: GenericParam) -> GenericArgument {
    match generic_param {
        GenericParam::Lifetime(param) => {
            GenericArgument::Lifetime(param.lifetime)
        }
        GenericParam::Type(param) => {
            GenericArgument::Type(Type::Path(TypePath {
                qself: None,
                path: Path {
                    leading_colon: None,
                    segments: Punctuated::from_iter([PathSegment {
                        ident: param.ident,
                        arguments: PathArguments::None,
                    }]),
                },
            }))
        }
        GenericParam::Const(param) => {
            GenericArgument::Const(Expr::Path(ExprPath {
                attrs: Vec::new(),
                qself: None,
                path: Path {
                    leading_colon: None,
                    segments: Punctuated::from_iter([PathSegment {
                        ident: param.ident,
                        arguments: PathArguments::None,
                    }]),
                },
            }))
        }
    }
}