func _[X Foo, T Far](x X) T {
	return T(x /* ERROR "cannot convert x (variable of type X constrained by Foo) to type T: cannot convert Foo (in X) to type Far (in T)" */)
}

// "x's type and T are unnamed pointer types and their pointer base types
// have identical underlying types if tags are ignored"

func _[X ~*Foo, T ~*Bar](x X) T         { return T(x) }
func _[X ~*Foo | ~*Bar, T ~*Bar](x X) T { return T(x) }

	// "V and T have identical underlying types if tags are ignored
	// and V and T are not type parameters"
	if IdenticalIgnoreTags(Vu, Tu) && Vp == nil && Tp == nil {
		return true
	}

	// "V and T are unnamed pointer types and their pointer base types
	// have identical underlying types if tags are ignored
	// and their pointer base types are not type parameters"
	if V, ok := V.(*Pointer); ok {
		if T, ok := T.(*Pointer); ok {

		var params []*Var
		if sig.params != nil {
			params = sig.params.vars
		}
		// Be consistent about named/unnamed parameters. This is not needed
		// for type-checking, but the newly constructed signature may appear
		// in an error message and then have mixed named/unnamed parameters.
		// (An alternative would be to not print parameter names in errors,

			}
			return Typ[Invalid], true
		}
		return p.base, true
	}
	return typ, false
}

// derefStructPtr dereferences typ if it is a (named or unnamed) pointer to a
// (named or unnamed) struct and returns its base. Otherwise it returns typ.
func derefStructPtr(typ Type) Type {
	if p, _ := under(typ).(*Pointer); p != nil {
		if _, ok := under(p.base).(*Struct); ok {
			return p.base

			for _, m := range asmUnnamedFP.FindAllStringSubmatch(line, -1) {
				off, _ := strconv.Atoi(m[2])
				v := fn.varByOffset[off]
				if v != nil {
					badf("use of unnamed argument %s; offset %d is %s+%d(FP)", m[1], off, v.name, v.off)
				} else {
					badf("use of unnamed argument %s", m[1])
				}
			}

			for _, m := range asmNamedFP.FindAllStringSubmatch(line, -1) {
				name := m[1]
				off := 0
				if m[2] != "" {

			}
			return Typ[Invalid], true
		}
		return p.base, true
	}
	return typ, false
}

// derefStructPtr dereferences typ if it is a (named or unnamed) pointer to a
// (named or unnamed) struct and returns its base. Otherwise it returns typ.
func derefStructPtr(typ Type) Type {
	if p, _ := under(typ).(*Pointer); p != nil {
		if _, ok := under(p.base).(*Struct); ok {
			return p.base

#include <stdint.h>

// use ugly atomic variable sync since that doesn't require calling back into
// Go code or OS dependencies
void issue7978c(uint32_t *sync);

// issue 8331 part 2 - part 1 in test.go
// A typedef of an unnamed struct is the same struct when
// #include'd twice.  No runtime test; just make sure it compiles.
#include "issue8331.h"

// issue 8945

typedef void (*PFunc8945)();

			return err
		}
	}

	return nil
}

// EmitFuncs writes out a function-level summary to the writer 'w'. A
// note on handling function literals: although we collect coverage
// data for unnamed literals, it probably does not make sense to
// include them in the function summary since there isn't any good way
// to name them (this is also consistent with the legacy cmd/cover

	// "V and T have identical underlying types if tags are ignored
	// and V and T are not type parameters"
	if IdenticalIgnoreTags(Vu, Tu) && Vp == nil && Tp == nil {
		return true
	}

	// "V and T are unnamed pointer types and their pointer base types
	// have identical underlying types if tags are ignored
	// and their pointer base types are not type parameters"
	if V, ok := V.(*Pointer); ok {
		if T, ok := T.(*Pointer); ok {

			// Conversion between two empty interfaces
			// requires no code.
			return ir.OCONVNOP, ""
		}
		if (src.Sym() == nil || dst.Sym() == nil) && !src.IsInterface() {
			// Conversion between two types, at least one unnamed,
			// needs no conversion. The exception is nonempty interfaces
			// which need to have their itab updated.
			return ir.OCONVNOP, ""
		}
		if src.IsShape() || dst.IsShape() {