cairo-lang-semantic 2.18.0

Cairo semantic model.
Documentation 
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//! > Test assignment.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > function_code
fn foo(p: felt252) {
    p = 7;
    a = 1 + 2;
    let b = 1;
    let _c: felt252 = (b = 5);
    let mut x = 1;
    x = true;
}

//! > function_name
foo

//! > module_code
extern type MyType;

//! > expected_diagnostics
error[E2083]: Cannot assign to an immutable variable.
 --> lib.cairo:3:5
    p = 7;
    ^^^^^

error[E0006]: Identifier not found.
 --> lib.cairo:4:5
    a = 1 + 2;
    ^

error[E2084]: Invalid left-hand side of assignment.
 --> lib.cairo:4:5
    a = 1 + 2;
    ^

error[E2083]: Cannot assign to an immutable variable.
 --> lib.cairo:6:24
    let _c: felt252 = (b = 5);
                       ^^^^^

error[E2041]: Unexpected argument type. Expected: "core::felt252", found: "()".
 --> lib.cairo:6:23
    let _c: felt252 = (b = 5);
                      ^^^^^^^

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

//! > Test a valid let statement with a string literal.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: false)

//! > function_code
fn foo() {
    let _x: ByteArray = "error";
}

//! > function_name
foo

//! > expected_diagnostics

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

//! > Test type mismatch of a string literal in a let statement.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > function_code
fn foo() {
    let _x: felt252 = "error";
}

//! > function_name
foo

//! > expected_diagnostics
error[E2311]: Mismatched types. The type `core::felt252` cannot be created from a string literal.
 --> lib.cairo:2:23
    let _x: felt252 = "error";
                      ^^^^^^^

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

//! > Test a valid let statement with a numeric literal.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: false)

//! > function_code
fn foo() {
    let _x: felt252 = 252;
}

//! > function_name
foo

//! > expected_diagnostics

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

//! > Test type mismatch of a numeric literal in a let statement.

//! > test_runner_name
test_function_diagnostics(expect_diagnostics: true)

//! > function_code
fn foo() {
    let _x: ByteArray = 252;
}

//! > function_name
foo

//! > expected_diagnostics
error[E2311]: Mismatched types. The type `core::byte_array::ByteArray` cannot be created from a numeric literal.
 --> lib.cairo:2:25
    let _x: ByteArray = 252;
                        ^^^