fn match_intrinsic_type_to_type<'tcx, 'a>(
        tcx: &ty::ctxt<'tcx>,
        position: &str,
        span: Span,
        structural_to_nominal: &mut HashMap<&'a intrinsics::Type, ty::Ty<'tcx>>,
        expected: &'a intrinsics::Type, t: ty::Ty<'tcx>)
{
    use intrinsics::Type::*;

    let simple_error = |real: &str, expected: &str| {
        span_err!(tcx.sess, span, E0442,
                  "intrinsic {} has wrong type: found {}, expected {}",
                  position, real, expected)
    };

    match *expected {
        Void => match t.sty {
            ty::TyTuple(ref v) if v.is_empty() => {},
            _ => simple_error(&format!("`{}`", t), "()"),
        },
        // (The width we pass to LLVM doesn't concern the type checker.)
        Integer(signed, bits, _llvm_width) => match (signed, bits, &t.sty) {
            (true,  8,  &ty::TyInt(hir::IntTy::TyI8)) |
            (false, 8,  &ty::TyUint(hir::UintTy::TyU8)) |
            (true,  16, &ty::TyInt(hir::IntTy::TyI16)) |
            (false, 16, &ty::TyUint(hir::UintTy::TyU16)) |
            (true,  32, &ty::TyInt(hir::IntTy::TyI32)) |
            (false, 32, &ty::TyUint(hir::UintTy::TyU32)) |
            (true,  64, &ty::TyInt(hir::IntTy::TyI64)) |
            (false, 64, &ty::TyUint(hir::UintTy::TyU64)) => {},
            _ => simple_error(&format!("`{}`", t),
                              &format!("`{}{n}`",
                                       if signed {"i"} else {"u"},
                                       n = bits)),
        },
        Float(bits) => match (bits, &t.sty) {
            (32, &ty::TyFloat(hir::FloatTy::TyF32)) |
            (64, &ty::TyFloat(hir::FloatTy::TyF64)) => {},
            _ => simple_error(&format!("`{}`", t),
                              &format!("`f{n}`", n = bits)),
        },
        Pointer(ref inner_expected, ref _llvm_type, const_) => {
            match t.sty {
                ty::TyRawPtr(ty::TypeAndMut { ty, mutbl }) => {
                    if (mutbl == hir::MutImmutable) != const_ {
                        simple_error(&format!("`{}`", t),
                                     if const_ {"const pointer"} else {"mut pointer"})
                    }
                    match_intrinsic_type_to_type(tcx, position, span, structural_to_nominal,
                                                 inner_expected, ty)
                }
                _ => simple_error(&format!("`{}`", t),
                                  &format!("raw pointer")),
            }
        }
        Vector(ref inner_expected, ref _llvm_type, len) => {
            if !t.is_simd() {
                simple_error(&format!("non-simd type `{}`", t),
                             "simd type");
                return;
            }
            let t_len = t.simd_size(tcx);
            if len as usize != t_len {
                simple_error(&format!("vector with length {}", t_len),
                             &format!("length {}", len));
                return;
            }
            let t_ty = t.simd_type(tcx);
            {
                // check that a given structural type always has the same an intrinsic definition
                let previous = structural_to_nominal.entry(expected).or_insert(t);
                if *previous != t {
                    // this gets its own error code because it is non-trivial
                    span_err!(tcx.sess, span, E0443,
                              "intrinsic {} has wrong type: found `{}`, expected `{}` which \
                               was used for this vector type previously in this signature",
                              position,
                              t,
                              *previous);
                    return;
                }
            }
            match_intrinsic_type_to_type(tcx,
                                         position,
                                         span,
                                         structural_to_nominal,
                                         inner_expected,
                                         t_ty)
        }
        Aggregate(_flatten, ref expected_contents) => {
            match t.sty {
                ty::TyTuple(ref contents) => {
                    if contents.len() != expected_contents.len() {
                        simple_error(&format!("tuple with length {}", contents.len()),
                                     &format!("tuple with length {}", expected_contents.len()));
                        return
                    }
                    for (e, c) in expected_contents.iter().zip(contents) {
                        match_intrinsic_type_to_type(tcx, position, span, structural_to_nominal,
                                                     e, c)
                    }
                }
                _ => simple_error(&format!("`{}`", t),
                                  &format!("tuple")),
            }
        }
    }
}
// walk the expected type and the actual type in lock step, checking they're
// the same, in a kinda-structural way, i.e. `Vector`s have to be simd structs with
// exactly the right element type
walk the expected type and the actual type in lock step, checking they're
the same, in a kinda-structural way, i.e. `Vector`s have to be simd structs with
exactly the right element type
walk the expected type and the actual type in lock step checking they ' re the same in a kinda - structural way i . e . ` Vector ` s have to be simd structs with exactly the right element type
fn match_intrinsic_type_to_type<'tcx, 'a>(
        tcx: &ty::ctxt<'tcx>,
        position: &str,
        span: Span,
        structural_to_nominal: &mut HashMap<&'a intrinsics::Type, ty::Ty<'tcx>>,
        expected: &'a intrinsics::Type, t: ty::Ty<'tcx>)
{
    use intrinsics::Type::*;
    let simple_error = |real: &str, expected: &str| {
        span_err!(tcx.sess, span, E0442,
                  "intrinsic {} has wrong type: found {}, expected {}",
                  position, real, expected)
    };
    match *expected {
        Void => match t.sty {
            ty::TyTuple(ref v) if v.is_empty() => {},
            _ => simple_error(&format!("`{}`", t), "()"),
        },
        // (The width we pass to LLVM doesn't concern the type checker.)
        Integer(signed, bits, _llvm_width) => match (signed, bits, &t.sty) {
            (true,  8,  &ty::TyInt(hir::IntTy::TyI8)) |
            (false, 8,  &ty::TyUint(hir::UintTy::TyU8)) |
            (true,  16, &ty::TyInt(hir::IntTy::TyI16)) |
            (false, 16, &ty::TyUint(hir::UintTy::TyU16)) |
            (true,  32, &ty::TyInt(hir::IntTy::TyI32)) |
            (false, 32, &ty::TyUint(hir::UintTy::TyU32)) |
            (true,  64, &ty::TyInt(hir::IntTy::TyI64)) |
            (false, 64, &ty::TyUint(hir::UintTy::TyU64)) => {},
            _ => simple_error(&format!("`{}`", t),
                              &format!("`{}{n}`",
                                       if signed {"i"} else {"u"},
                                       n = bits)),
        },
        Float(bits) => match (bits, &t.sty) {
            (32, &ty::TyFloat(hir::FloatTy::TyF32)) |
            (64, &ty::TyFloat(hir::FloatTy::TyF64)) => {},
            _ => simple_error(&format!("`{}`", t),
                              &format!("`f{n}`", n = bits)),
        },
        Pointer(ref inner_expected, ref _llvm_type, const_) => {
            match t.sty {
                ty::TyRawPtr(ty::TypeAndMut { ty, mutbl }) => {
                    if (mutbl == hir::MutImmutable) != const_ {
                        simple_error(&format!("`{}`", t),
                                     if const_ {"const pointer"} else {"mut pointer"})
                    }
                    match_intrinsic_type_to_type(tcx, position, span, structural_to_nominal,
                                                 inner_expected, ty)
                }
                _ => simple_error(&format!("`{}`", t),
                                  &format!("raw pointer")),
            }
        }
        Vector(ref inner_expected, ref _llvm_type, len) => {
            if !t.is_simd() {
                simple_error(&format!("non-simd type `{}`", t),
                             "simd type");
                return;
            }
            let t_len = t.simd_size(tcx);
            if len as usize != t_len {
                simple_error(&format!("vector with length {}", t_len),
                             &format!("length {}", len));
                return;
            }
            let t_ty = t.simd_type(tcx);
            {
                // check that a given structural type always has the same an intrinsic definition
                let previous = structural_to_nominal.entry(expected).or_insert(t);
                if *previous != t {
                    // this gets its own error code because it is non-trivial
                    span_err!(tcx.sess, span, E0443,
                              "intrinsic {} has wrong type: found `{}`, expected `{}` which \
                               was used for this vector type previously in this signature",
                              position,
                              t,
                              *previous);
                    return;
                }
            }
            match_intrinsic_type_to_type(tcx,
                                         position,
                                         span,
                                         structural_to_nominal,
                                         inner_expected,
                                         t_ty)
        }
        Aggregate(_flatten, ref expected_contents) => {
            match t.sty {
                ty::TyTuple(ref contents) => {
                    if contents.len() != expected_contents.len() {
                        simple_error(&format!("tuple with length {}", contents.len()),
                                     &format!("tuple with length {}", expected_contents.len()));
                        return
                    }
                    for (e, c) in expected_contents.iter().zip(contents) {
                        match_intrinsic_type_to_type(tcx, position, span, structural_to_nominal,
                                                     e, c)
                    }
                }
                _ => simple_error(&format!("`{}`", t),
                                  &format!("tuple")),
            }
        }
    }
}
fn match_intrinsic_type_to_type < ' tcx , ' a > ( tcx : & ty :: ctxt < ' tcx > , position : & str , span : Span , structural_to_nominal : & mut HashMap < & ' a intrinsics :: Type , ty :: Ty < ' tcx > > , expected : & ' a intrinsics :: Type , t : ty :: Ty < ' tcx > ) { use intrinsics :: Type :: * ; let simple_error = | real : & str , expected : & str | { span_err ! ( tcx sess span E0442 " " position real expected ) } ; match * expected { Void => match t . sty { ty :: TyTuple ( ref v ) if v . is_empty ( ) => { } , _ => simple_error ( & format ! ( " " t ) , " " ) , } , // (The width we pass to LLVM doesn't concern the type checker.) Integer ( signed , bits , _llvm_width ) => match ( signed , bits , & t . sty ) { ( true , 8 , & ty :: TyInt ( hir :: IntTy :: TyI8 ) ) | ( false , 8 , & ty :: TyUint ( hir :: UintTy :: TyU8 ) ) | ( true , 16 , & ty :: TyInt ( hir :: IntTy :: TyI16 ) ) | ( false , 16 , & ty :: TyUint ( hir :: UintTy :: TyU16 ) ) | ( true , 32 , & ty :: TyInt ( hir :: IntTy :: TyI32 ) ) | ( false , 32 , & ty :: TyUint ( hir :: UintTy :: TyU32 ) ) | ( true , 64 , & ty :: TyInt ( hir :: IntTy :: TyI64 ) ) | ( false , 64 , & ty :: TyUint ( hir :: UintTy :: TyU64 ) ) => { } , _ => simple_error ( & format ! ( " " t ) , & format ! ( " " if signed { " " } else { " " } n bits ) ) , } , Float ( bits ) => match ( bits , & t . sty ) { ( 32 , & ty :: TyFloat ( hir :: FloatTy :: TyF32 ) ) | ( 64 , & ty :: TyFloat ( hir :: FloatTy :: TyF64 ) ) => { } , _ => simple_error ( & format ! ( " " t ) , & format ! ( " " n bits ) ) , } , Pointer ( ref inner_expected , ref _llvm_type , const_ ) => { match t . sty { ty :: TyRawPtr ( ty :: TypeAndMut { ty , mutbl } ) => { if ( mutbl == hir :: MutImmutable ) != const_ { simple_error ( & format ! ( " " t ) , if const_ { " " } else { " " } ) } match_intrinsic_type_to_type ( tcx , position , span , structural_to_nominal , inner_expected , ty ) } _ => simple_error ( & format ! ( " " t ) , & format ! ( " " ) ) , } } Vector ( ref inner_expected , ref _llvm_type , len ) => { if ! t . is_simd ( ) { simple_error ( & format ! ( " " t ) , " " ) ; return ; } let t_len = t . simd_size ( tcx ) ; if len as usize != t_len { simple_error ( & format ! ( " " t_len ) , & format ! ( " " len ) ) ; return ; } let t_ty = t . simd_type ( tcx ) ; { // check that a given structural type always has the same an intrinsic definition let previous = structural_to_nominal . entry ( expected ) . or_insert ( t ) ; if * previous != t { // this gets its own error code because it is non-trivial span_err ! ( tcx sess span E0443 " \
 " position t previous ) ; return ; } } match_intrinsic_type_to_type ( tcx , position , span , structural_to_nominal , inner_expected , t_ty ) } Aggregate ( _flatten , ref expected_contents ) => { match t . sty { ty :: TyTuple ( ref contents ) => { if contents . len ( ) != expected_contents . len ( ) { simple_error ( & format ! ( " " contents len ( ) ) , & format ! ( " " expected_contents len ( ) ) ) ; return } for ( e , c ) in expected_contents . iter ( ) . zip ( contents ) { match_intrinsic_type_to_type ( tcx , position , span , structural_to_nominal , e , c ) } } _ => simple_error ( & format ! ( " " t ) , & format ! ( " " ) ) , } } } }
walk the expected type and the actual type in lock step, checking they're
the same, in a kinda-structural way, i.e.
walk the expected type and the actual type in lock step checking they ' re the same in a kinda - structural way i . e .
tcx
&ty::ctxt<'tcx>
position
&str
span
Span
structural_to_nominal
&mut HashMap<&'a intrinsics::Type, ty::Ty<'tcx>>
expected
&'a intrinsics::Type
t
ty::Ty<'tcx>
tcx
&ty::ctxt<'tcx>
position
&str
span
Span
structural_to_nominal
&mut HashMap<&'a intrinsics::Type, ty::Ty<'tcx>>
expected
&'a intrinsics::Type
t
ty::Ty<'tcx>