cairo-lang-semantic 2.18.0

Cairo semantic model.
Documentation 
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//! > Test negative impl diagnostics.

//! > test_runner_name
test_expr_diagnostics(expect_diagnostics: true)

//! > expr_code
{
    Bad::<u128, core::NegImpl>::bad();
    Bad::<u128, _>::bad();
}

//! > module_code
pub trait NegImpl {}

pub trait Bad<T, -NegImpl> {
    fn bad() -> T;
}

pub impl ImplBad<T, -NegImpl> of Bad<T, _> {
    fn bad() -> T {
        panic!("Bad::bad() called")
    }
}

pub impl ImplBad2<T> of Bad<T, T> {
    fn bad() -> T {
        panic!("Bad::bad() called")
    }
}

//! > function_body

//! > expected_diagnostics
error[E2078]: Negative impls supported only in impl definitions.
 --> lib.cairo:3:18
pub trait Bad<T, -NegImpl> {
                 ^^^^^^^^

error[E2122]: Only `_` is valid as a negative impl argument.
 --> lib.cairo:13:32
pub impl ImplBad2<T> of Bad<T, T> {
                               ^

error[E2122]: Only `_` is valid as a negative impl argument.
 --> lib.cairo:20:17
    Bad::<u128, core::NegImpl>::bad();
                ^^^^^^^^^^^^^

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

//! > Test cycles

//! > test_runner_name
test_expr_diagnostics(expect_diagnostics: true)

//! > expr_code
{
    NegImpl::bar()
}

//! > module_code
pub trait NegImpl {
    fn bar();
}

impl BadImpl<-NegImpl> of NegImpl {
    fn bar() {}
}

//! > function_body

//! > expected_diagnostics
error[E2301]: Inference cycle detected
 --> lib.cairo:10:14
    NegImpl::bar()
             ^^^