cairo-lang-semantic 2.21.0

Cairo semantic model.
Documentation 
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//! > Test extern fn diagnostics.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
#[allow(extern_outside_corelib)]
extern fn bar() -> bad_type;
fn foo() {
    bar()
}

//! > expected_diagnostics
error[E0006]: Type not found.
 --> lib.cairo:2:20
extern fn bar() -> bad_type;
                   ^^^^^^^^

error[E2116]: An extern function must be marked as nopanic.
 --> lib.cairo:1:1-2:28
  #[allow(extern_outside_corelib)]
 _^
| extern fn bar() -> bad_type;
|____________________________^

//! > ==========================================================================

//! > Test no ICE when an item-level macro call names an enum variant whose type comes from a generic extern function with a trait bound.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
#[allow(extern_outside_corelib)]
extern fn g<T, +Drop<T>>(x: T) nopanic;
enum E {
    A: g::<felt252>::Coupon,
}
E::A!(());

//! > expected_diagnostics
error[E2028]: Cycle detected while resolving generic param. Try specifying the generic impl parameter explicitly to break the cycle.
 --> lib.cairo:2:16
extern fn g<T, +Drop<T>>(x: T) nopanic;
               ^^^^^^^^

error[E2165]: Coupon cannot be used with extern functions.
 --> lib.cairo:4:22
    A: g::<felt252>::Coupon,
                     ^^^^^^

error[E2156]: Inline macro `E::A` not found.
 --> lib.cairo:6:1
E::A!(());
^^^^^^^^^^