cairo-lang-semantic 2.21.0

Cairo semantic model.
Documentation 
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//! > Test struct generics.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: false)

//! > cairo_code
struct A<T> {
    a: T,
}
fn foo(a: A<felt252>) -> felt252 {
    a.a
}

//! > expected_diagnostics

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

//! > Test invalid recursive struct.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
struct A {
    member: A,
}

struct B {
    member: C,
    member2: A,
}

struct C {
    member: B,
}

//! > expected_diagnostics
error[E2052]: Recursive type "A" has infinite size.
 --> lib.cairo:2:5
    member: A,
    ^^^^^^^^^

error[E2052]: Recursive type "C" has infinite size.
 --> lib.cairo:6:5
    member: C,
    ^^^^^^^^^

error[E2052]: Recursive type "A" has infinite size.
 --> lib.cairo:7:5
    member2: A,
    ^^^^^^^^^^

error[E2052]: Recursive type "B" has infinite size.
 --> lib.cairo:11:5
    member: B,
    ^^^^^^^^^

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

//! > Test a recursive struct used as a value is reported only where the cycle is closed.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
struct A {
    member: A,
}
fn foo(a: A) -> A {
    a
}

//! > expected_diagnostics
error[E2052]: Recursive type "A" has infinite size.
 --> lib.cairo:2:5
    member: A,
    ^^^^^^^^^

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

//! > Test phantom recursive struct.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: false)

//! > cairo_code
#[phantom]
struct A {
    member: A,
}

//! > expected_diagnostics

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

//! > Test struct containing phantom.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
#[phantom]
struct A {}

struct B {
    member: A,
}

//! > expected_diagnostics
error[E2020]: Non-phantom type containing phantom type.
 --> lib.cairo:5:5
    member: A,
    ^^^^^^^^^

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

//! > Test struct containing empty array.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
struct A {
    member: Array<((), ())>,
}

//! > expected_diagnostics
error[E2053]: Cannot have array of type "((), ())" that is zero sized.
 --> lib.cairo:2:5
    member: Array<((), ())>,
    ^^^^^^^^^^^^^^^^^^^^^^^

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

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

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > cairo_code
struct W<T, +Drop<T>> {
    x: T,
}
enum E {
    A: W<felt252>,
}
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:1:13
struct W<T, +Drop<T>> {
            ^^^^^^^^

error[E2156]: Inline macro `E::A` not found.
 --> lib.cairo:7:1
E::A!(());
^^^^^^^^^^