Function macro_tools::orphan::typ::parameter_first

pub fn parameter_first(ty: &Type) -> Result<&Type>

Extracts the first generic parameter from a given syn::Type if any exists.

This function is designed to analyze a type and retrieve its first generic parameter. It is particularly useful when working with complex types in macro expansions and needs to extract specific type information for further processing.

Example

let type_string = "Result< Option< i32 >, Error >";
let parsed_type : syn::Type = syn::parse_str( type_string ).expect( "Type should parse correctly" );
let first_param = macro_tools::typ::parameter_first( &parsed_type ).expect( "Should have at least one parameter" );
// Option< i32 >