}

	if !t.ChanDir().CanSend() {
		base.Errorf("invalid operation: %v (cannot close receive-only channel)", n)
		n.SetType(nil)
		return n
	}
	return n
}

// tcComplex typechecks an OCOMPLEX node.
func tcComplex(n *ir.BinaryExpr) ir.Node {
	l := Expr(n.X)
	r := Expr(n.Y)
	if l.Type() == nil || r.Type() == nil {
		n.SetType(nil)
		return n
	}
	l, r = defaultlit2(l, r, false)

				return true
			}
		}
	}

	// "V and T are both integer or floating point types"
	if isIntegerOrFloat(Vu) && isIntegerOrFloat(Tu) {
		return true
	}

	// "V and T are both complex types"
	if isComplex(Vu) && isComplex(Tu) {
		return true
	}

	// "V is an integer or a slice of bytes or runes and T is a string type"
	if (isInteger(Vu) || isBytesOrRunes(Vu)) && isString(Tu) {
		return true
	}

type A [1]*complex128

//go:noinline
func (i I) X() C {
	cx := complex(0, float64(i.x))
	return C{&cx}
}

//go:noinline
func (f F) X() C {
	cx := complex(f.x, 0)
	return C{&cx}
}

//go:noinline
func (c C) X() C {
	cx := complex(imag(*c.x), real(*c.x))
	return C{&cx}
}

//go:noinline
func (d D) X() C {
	cx := complex(float64(imag(d.x)), -float64(real(d.x)))
	return C{&cx}
}

		return -a
	}
	return a
}

// Complex matches the two complex types, which do not have a < operator.
type Complex interface {
	~complex64 | ~complex128
}

func realimag(x any) (re, im float64) {
	switch z := x.(type) {
	case complex64:
		re = float64(real(z))
		im = float64(imag(z))
	case complex128:
		re = real(z)
		im = imag(z)
	default:
		panic("unknown complex type")
	}
	return
}

			return x
		case math.IsInf(im, 0) || math.IsNaN(im):
			if re < 0 {
				return complex(0, math.Copysign(0, im))
			} else {
				return complex(math.Inf(1.0), math.NaN())
			}
		}
	case math.IsNaN(re):
		if im == 0 {
			return complex(math.NaN(), im)
		}
	}
	r := math.Exp(real(x))
	s, c := math.Sincos(imag(x))
	return complex(r*c, r*s)

		if real(x) == 0 {
			return complex(0, imag(x))
		}
		if real(x) < 0 {
			return complex(0, math.Copysign(math.Sqrt(-real(x)), imag(x)))
		}
		return complex(math.Sqrt(real(x)), imag(x))
	} else if math.IsInf(imag(x), 0) {
		return complex(math.Inf(1.0), imag(x))
	}
	if real(x) == 0 {
		if imag(x) < 0 {
			r := math.Sqrt(-0.5 * imag(x))
			return complex(r, -r)
		}
		r := math.Sqrt(0.5 * imag(x))

type OrderedNumeric interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64 |
		uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
		float32 | ~float64
}

// Complex is a type bound that matches the two complex types, which do not have a < operator.
type Complex interface {
	~complex64 | ~complex128
}

// OrderedAbs is a helper type that defines an Abs method for
// ordered numeric types.
type OrderedAbs[T OrderedNumeric] T

type orderedNumeric interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64 |
		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
		~float32 | ~float64
}

// Complex matches the two complex types, which do not have a < operator.
type Complex interface {
	~complex64 | ~complex128
}

// orderedAbs is a helper type that defines an Abs method for
// a struct containing an ordered numeric type.

// license that can be found in the LICENSE file.

package main

import (
	"fmt"
)

type Complex interface {
	~complex64 | ~complex128
}

func zero[T Complex]() T {
	return T(0)
}
func pi[T Complex]() T {
	return T(3.14)
}
func sqrtN1[T Complex]() T {
	return T(-1i)
}

func main() {
	fmt.Println(zero[complex128]())
	fmt.Println(pi[complex128]())

// source listings for the gamma function and the incomplete beta
// integral.
//
//   Stephen L. Moshier
//   ******@****.***

// Complex natural logarithm
//
// DESCRIPTION:
//
// Returns complex logarithm to the base e (2.718...) of
// the complex argument z.
//
// If
//       z = x + iy, r = sqrt( x**2 + y**2 ),
// then
//       w = log(r) + i arctan(y/x).
//