cairo-lang-lowering 2.4.1

Cairo lowering phase.
Documentation 
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//! > Test member borrowing.

//! > test_runner_name
test_function_lowering

//! > function
fn foo(ref a: A) {
    a.f = 5;
    mutate(ref a.b.c.f);
}

//! > function_name
foo

//! > module_code
struct A {
  b: B,
  f: felt252,
  f2: felt252
}
struct B {
  f: felt252,
  c: C
}
struct C {
  f: felt252,
}
extern fn mutate(ref f: felt252) nopanic;

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > lowering_flat
Parameters: v0: test::A
blk0 (root):
Statements:
  (v2: test::B, v3: core::felt252, v4: core::felt252) <- struct_destructure(v0)
  (v5: core::felt252, v6: test::C) <- struct_destructure(v2)
  (v7: core::felt252) <- struct_destructure(v6)
  (v8: core::felt252) <- test::mutate(v7)
  (v1: core::felt252) <- 5u
  (v9: ()) <- struct_construct()
  (v10: test::C) <- struct_construct(v8)
  (v11: test::B) <- struct_construct(v5, v10)
  (v12: test::A) <- struct_construct(v11, v1, v4)
End:
  Return(v12, v9)

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

//! > Dup member.

//! > test_runner_name
test_function_lowering

//! > function
fn foo(ref my_struct: MyStruct) {
  let result = sub_three(my_struct.value);
  my_struct.value = result;
}

//! > function_name
foo

//! > module_code
#[derive(Drop)]
struct MyStruct {
    value: felt252,
    arr: Array<felt252>
}

fn sub_three(value: felt252) -> felt252 {
  value - 3
}

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > lowering_flat
Parameters: v0: test::MyStruct
blk0 (root):
Statements:
  (v1: core::felt252, v2: core::array::Array::<core::felt252>) <- struct_destructure(v0)
  (v3: core::felt252) <- test::sub_three(v1)
  (v4: ()) <- struct_construct()
  (v5: test::MyStruct) <- struct_construct(v3, v2)
End:
  Return(v5, v4)