cairo-lang-lowering 2.19.0

Cairo lowering phase.
Documentation 
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//! > Refutable enum-variant pattern in `let` (no `else`).

//! > test_runner_name
test_function_lowering(expect_diagnostics: true)

//! > function_code
fn foo(opt: Option<u32>) -> u32 {
    let Option::Some(x) = opt;
    x
}

//! > function_name
foo

//! > semantic_diagnostics

//! > lowering_diagnostics
error[E3010]: Refutable pattern in irrefutable binding. Refutable patterns are only supported in `match`, `if let`, `while let`, and `let ... else`.
 --> lib.cairo:2:9
    let Option::Some(x) = opt;
        ^^^^^^^^^^^^^^^

//! > lowering_flat
<Failed lowering function - run with RUST_LOG=warn (or less) to see diagnostics>

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

//! > Refutable literal pattern in `let`.

//! > test_runner_name
test_function_lowering(expect_diagnostics: true)

//! > function_code
fn foo(x: u32) {
    let 5 = x;
}

//! > function_name
foo

//! > semantic_diagnostics

//! > lowering_diagnostics
error[E3010]: Refutable pattern in irrefutable binding. Refutable patterns are only supported in `match`, `if let`, `while let`, and `let ... else`.
 --> lib.cairo:2:9
    let 5 = x;
        ^

//! > lowering_flat
<Failed lowering function - run with RUST_LOG=warn (or less) to see diagnostics>

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

//! > Refutable enum-variant pattern nested inside a struct destructure in `let`.

//! > test_runner_name
test_function_lowering(expect_diagnostics: true)

//! > function_code
fn foo(s: Wrapper) -> u32 {
    let Wrapper { inner: Option::Some(x) } = s;
    x
}

//! > function_name
foo

//! > module_code
#[derive(Drop)]
struct Wrapper {
    inner: Option<u32>,
}

//! > semantic_diagnostics

//! > lowering_diagnostics
error[E3010]: Refutable pattern in irrefutable binding. Refutable patterns are only supported in `match`, `if let`, `while let`, and `let ... else`.
 --> lib.cairo:6:26
    let Wrapper { inner: Option::Some(x) } = s;
                         ^^^^^^^^^^^^^^^

//! > lowering_flat
<Failed lowering function - run with RUST_LOG=warn (or less) to see diagnostics>

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

//! > Refutable pattern in a `for` loop binding.

//! > test_runner_name
test_function_lowering(expect_diagnostics: true)

//! > function_code
fn foo(opts: Array<Option<u32>>) {
    for Option::Some(_x) in opts {}
}

//! > function_name
foo

//! > semantic_diagnostics

//! > lowering_diagnostics
error[E3010]: Refutable pattern in irrefutable binding. Refutable patterns are only supported in `match`, `if let`, `while let`, and `let ... else`.
 --> lib.cairo:2:9
    for Option::Some(_x) in opts {}
        ^^^^^^^^^^^^^^^^

//! > lowering_flat
<Failed lowering function - run with RUST_LOG=warn (or less) to see diagnostics>

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

//! > Refutable fixed-size-array pattern on a Span value in `let`.

//! > test_runner_name
test_function_lowering(expect_diagnostics: true)

//! > function_code
fn foo() {
    let arr: Array<u32> = array![100, 200, 300];
    let s: Span<u32> = arr.span();
    let [_a, _b, _c] = s;
}

//! > function_name
foo

//! > semantic_diagnostics

//! > lowering_diagnostics
error[E3010]: Refutable pattern in irrefutable binding. Refutable patterns are only supported in `match`, `if let`, `while let`, and `let ... else`.
 --> lib.cairo:4:9
    let [_a, _b, _c] = s;
        ^^^^^^^^^^^^

//! > lowering_flat
<Failed lowering function - run with RUST_LOG=warn (or less) to see diagnostics>