Function function_signature_implicit_parameters 

pub fn function_signature_implicit_parameters<'db>(
    diagnostics: &mut SemanticDiagnostics<'db>,
    db: &'db dyn Database,
    resolver: &mut Resolver<'db>,
    sig: &FunctionSignature<'db>,
) -> Vec<TypeId<'db>>

Returns the implicit parameters of the given function signature’s AST.