cairo-lang-lowering 2.8.5

//! > unused captures

//! > test_runner_name
test_borrow_check

//! > function
fn foo(a: u32, mut b: Array<u32>, mut c: Felt252Dict<felt252>,) {
    |d: u32| {
        let _ = a + d;
    };
    |d: u32| {
        let _ = b.append(d);
    };
    |d: felt252| {
        let _ = c.insert(d, d);
    };
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Unsupported feature.
 --> lib.cairo:2:5
    |d: u32| {
    ^********^

error: Unsupported feature.
 --> lib.cairo:5:5
    |d: u32| {
    ^********^

error: Unsupported feature.
 --> lib.cairo:8:5
    |d: felt252| {
    ^************^

//! > lowering
Parameters: v0: core::integer::u32, v1: core::array::Array::<core::integer::u32>, v2: core::dict::Felt252Dict::<core::felt252>
blk0 (root):
Statements:
  (v3: {closure@lib.cairo:2:5: 2:13}) <- struct_construct(v0{`a`})
  (v4: {closure@lib.cairo:5:5: 5:13}) <- struct_construct(v1{`b`})
  (v5: {closure@lib.cairo:8:5: 8:17}) <- struct_construct(v2{`c`})
  (v6: ()) <- struct_construct()
End:
  Return(v6)

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

//! > Panic destructable capture

//! > test_runner_name
test_borrow_check

//! > function
fn foo(a: PanicDestructable) {
    || {
        let PanicDestructable { } = a;
    };
    panic_with_felt252('Panic');
}

//! > function_name
foo

//! > module_code
struct PanicDestructable {}

impl MyPanicDesruct of PanicDestruct<PanicDestructable> {
    fn panic_destruct(self: PanicDestructable, ref panic: Panic) nopanic {
        let PanicDestructable { } = self;
    }
}

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Unsupported feature.
 --> lib.cairo:9:5
    || {
    ^**^

//! > lowering
Parameters: v0: test::PanicDestructable
blk0 (root):
Statements:
  (v1: {closure@lib.cairo:9:5: 9:7}) <- struct_construct(v0{`a`})
  (v2: core::felt252) <- 345232009571
  (v3: core::never) <- core::panic_with_felt252(v2{`'Panic'`})
End:
  Match(match_enum(v3{`panic_with_felt252('Panic')`}) {
  })

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

//! > invalidated capture

//! > test_runner_name
test_borrow_check

//! > function
fn foo(mut a: Array<u32>) {
    |b: u32| {
        let _ = a.append(b);
    };
    a.append(0);
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Unsupported feature.
 --> lib.cairo:2:5
    |b: u32| {
    ^********^

//! > lowering
Parameters: v0: core::array::Array::<core::integer::u32>
blk0 (root):
Statements:
  (v1: {closure@lib.cairo:2:5: 2:13}) <- struct_construct(v0{`a`})
  (v2: core::integer::u32) <- 0
  (v3: core::array::Array::<core::integer::u32>) <- struct_destructure(v1{`a`})
  (v5: core::array::Array::<core::integer::u32>, v4: ()) <- core::array::ArrayImpl::<core::integer::u32>::append(v3{`a`}, v2{`0`})
  (v6: ()) <- struct_construct()
End:
  Return(v6)

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

//! > capture use after invalidatian.

//! > test_runner_name
test_borrow_check

//! > function
fn foo(mut a: Array<u32>) {
    let f = |b: u32| {
        let _ = a.append(b);
    };
    a.append(0);
    use_f(f)
}

//! > function_name
foo

//! > module_code
extern fn use_f<T>(f: T) nopanic;

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Variable was previously moved.
 --> lib.cairo:7:11
    use_f(f)
          ^
note: variable was previously used here:
  --> lib.cairo:6:5
    a.append(0);
    ^
note: Trait has no implementation in context: core::traits::Copy::<{closure@lib.cairo:3:13: 3:21}>.

error: Unsupported feature.
 --> lib.cairo:3:13
    let f = |b: u32| {
            ^********^

//! > lowering
Parameters: v0: core::array::Array::<core::integer::u32>
blk0 (root):
Statements:
  (v1: {closure@lib.cairo:3:13: 3:21}) <- struct_construct(v0{`a`})
  (v2: core::integer::u32) <- 0
  (v3: core::array::Array::<core::integer::u32>) <- struct_destructure(v1{`a`})
  (v5: core::array::Array::<core::integer::u32>, v4: ()) <- core::array::ArrayImpl::<core::integer::u32>::append(v3{`a`}, v2{`0`})
  () <- test::use_f::<{closure@lib.cairo:3:13: 3:21}>(v1{`f`})
  (v6: ()) <- struct_construct()
End:
  Return(v6)

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

//! > Snapshot capture

//! > test_runner_name
test_borrow_check

//! > function
fn foo(mut a: Array<u32>) {
    let f = |_b: u32| {
        let _ = a.len();
    };
    a.append(0);
    use_f(f)
}

//! > function_name
foo

//! > module_code
extern fn use_f<T>(f: T) nopanic;

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Unsupported feature.
 --> lib.cairo:3:13
    let f = |_b: u32| {
            ^*********^

//! > lowering
Parameters: v0: core::array::Array::<core::integer::u32>
blk0 (root):
Statements:
  (v1: core::array::Array::<core::integer::u32>, v2: @core::array::Array::<core::integer::u32>) <- snapshot(v0{`a`})
  (v3: {closure@lib.cairo:3:13: 3:22}) <- struct_construct(v2{`|_b: u32| { let _ = a.len(); }`})
  (v4: core::integer::u32) <- 0
  (v6: core::array::Array::<core::integer::u32>, v5: ()) <- core::array::ArrayImpl::<core::integer::u32>::append(v1{`a`}, v4{`0`})
  () <- test::use_f::<{closure@lib.cairo:3:13: 3:22}>(v3{`f`})
  (v7: ()) <- struct_construct()
End:
  Return(v7)

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

//! > Capture changed but unused variable.

//! > test_runner_name
test_borrow_check

//! > function
fn foo(mut a: Array<u32>) {
    |_b: u32| {
        a = array![];
    };
    a.append(0);
}

//! > function_name
foo

//! > module_code
extern fn use_f<T>(f: T) nopanic;

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Unsupported feature.
 --> lib.cairo:3:5
    |_b: u32| {
    ^*********^

//! > lowering
Parameters: v0: core::array::Array::<core::integer::u32>
blk0 (root):
Statements:
  (v1: {closure@lib.cairo:3:5: 3:14}) <- struct_construct(v0{`a`})
  (v2: core::integer::u32) <- 0
  (v3: core::array::Array::<core::integer::u32>) <- struct_destructure(v1{`a`})
  (v5: core::array::Array::<core::integer::u32>, v4: ()) <- core::array::ArrayImpl::<core::integer::u32>::append(v3{`a`}, v2{`0`})
  (v6: ()) <- struct_construct()
End:
  Return(v6)