cairo-lang-lowering 2.17.0

Cairo lowering phase.
Documentation 
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//! > Test match with never

//! > test_runner_name
test_trim_unreachable

//! > function_code
fn foo(x: Option<NeverWithDrop>, a: u32) {
    match x {
        Some(i_am_never) => {
            let _b: u16 = a.try_into().unwrap_or(0);
            match i_am_never {}
        },
        None => {},
    }
}

//! > function_name
foo

//! > module_code
#[derive(Drop)]
enum NeverWithDrop {}

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > before
Parameters: v0: core::option::Option::<test::NeverWithDrop>, v1: core::integer::u32
blk0 (root):
Statements:
End:
  Match(match_enum(v0) {
    Option::Some(v2) => blk1,
    Option::None(v3) => blk2,
  })

blk1:
Statements:
  (v4: core::option::Option::<core::integer::u16>) <- core::integer::DowncastableIntTryInto::<core::integer::u32, core::integer::u16, core::integer::DowncastableU32, core::integer::DowncastableU16, _>::try_into(v1)
  (v5: core::integer::u16) <- 0
  (v6: core::integer::u16) <- core::option::OptionTraitImpl::<core::integer::u16>::unwrap_or::<core::traits::DestructFromDrop::<core::integer::u16, core::integer::u16Drop>>(v4, v5)
End:
  Match(match_enum(v2) {
  })

blk2:
Statements:
End:
  Goto(blk3, {})

blk3:
Statements:
  (v7: ()) <- struct_construct()
  () <- struct_destructure(v7)
End:
  Return()

//! > after
Parameters: v0: core::option::Option::<test::NeverWithDrop>, v1: core::integer::u32
blk0 (root):
Statements:
End:
  Match(match_enum(v0) {
    Option::Some(v2) => blk1,
    Option::None(v3) => blk2,
  })

blk1:
Statements:
End:
  Match(match_enum(v2) {
  })

blk2:
Statements:
End:
  Goto(blk3, {})

blk3:
Statements:
  (v7: ()) <- struct_construct()
  () <- struct_destructure(v7)
End:
  Return()

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

//! > Test a function with a never argument

//! > test_runner_name
test_trim_unreachable

//! > function_code
fn foo(never_ty: NeverWithDrop, a: u32) {
    if a == 0 {
        let _b: u16 = a.try_into().unwrap_or(0);
    }

    match never_ty {}
}

//! > function_name
foo

//! > module_code
#[derive(Drop)]
enum NeverWithDrop {}

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > before
Parameters: v0: test::NeverWithDrop, v1: core::integer::u32
blk0 (root):
Statements:
  (v2: core::integer::u32, v3: @core::integer::u32) <- snapshot(v1)
  (v4: core::integer::u32) <- 0
  (v5: core::integer::u32, v6: @core::integer::u32) <- snapshot(v4)
  (v7: core::bool) <- core::integer::U32PartialEq::eq(v3, v6)
End:
  Match(match_enum(v7) {
    bool::False(v9) => blk2,
    bool::True(v8) => blk1,
  })

blk1:
Statements:
  (v10: core::option::Option::<core::integer::u16>) <- core::integer::DowncastableIntTryInto::<core::integer::u32, core::integer::u16, core::integer::DowncastableU32, core::integer::DowncastableU16, _>::try_into(v2)
  (v11: core::integer::u16) <- 0
  (v12: core::integer::u16) <- core::option::OptionTraitImpl::<core::integer::u16>::unwrap_or::<core::traits::DestructFromDrop::<core::integer::u16, core::integer::u16Drop>>(v10, v11)
End:
  Goto(blk3, {})

blk2:
Statements:
End:
  Goto(blk3, {})

blk3:
Statements:
End:
  Match(match_enum(v0) {
  })

//! > after
Parameters: v0: test::NeverWithDrop, v1: core::integer::u32
blk0 (root):
Statements:
End:
  Match(match_enum(v0) {
  })

blk1:
Statements:
  (v10: core::option::Option::<core::integer::u16>) <- core::integer::DowncastableIntTryInto::<core::integer::u32, core::integer::u16, core::integer::DowncastableU32, core::integer::DowncastableU16, _>::try_into(v2)
  (v11: core::integer::u16) <- 0
  (v12: core::integer::u16) <- core::option::OptionTraitImpl::<core::integer::u16>::unwrap_or::<core::traits::DestructFromDrop::<core::integer::u16, core::integer::u16Drop>>(v10, v11)
End:
  Goto(blk3, {})

blk2:
Statements:
End:
  Goto(blk3, {})

blk3:
Statements:
End:
  Match(match_enum(v0) {
  })