// typehash, but we want to report the topmost type in
		// the error text (e.g. in a struct with a field of slice type
		// we want to report the struct, not the slice).
		panic(errorString("hash of unhashable type " + toRType(t).string()))
	}
	if isDirectIface(t) {
		return c1 * typehash(t, unsafe.Pointer(&a.data), h^c0)
	} else {
		return c1 * typehash(t, a.data, h^c0)
	}
}

package main

import "reflect"

// complicated enough to require a compile-generated hash function
type K struct {
	a, b int32 // these get merged by the compiler into a single field, something typehash doesn't do
	c    float64
}

func main() {
	k := K{a: 1, b: 2, c: 3}

	// Make a reflect map.
	m := reflect.MakeMap(reflect.MapOf(reflect.TypeOf(K{}), reflect.TypeOf(true)))

			} else {
				t = prev.typemap[typeOff(tl)]
			}
			// Add to typehash if not seen before.
			tlist := typehash[t.Hash]
			for _, tcur := range tlist {
				if tcur == t {
					continue collect
				}
			}
			typehash[t.Hash] = append(tlist, t)
		}

		if md.typemap == nil {
			// If any of this module's typelinks match a type from a

		i--
	}
	const dot = "·"
	if i >= len(dot) && name[i-len(dot):i] == dot {
		i -= len(dot)
		return name[:i], name[i:]
	}
	return name, ""
}

// TypeHash computes a hash value for type t to use in type switch statements.
func TypeHash(t *Type) uint32 {
	p := t.LinkString()

	// Using SHA256 is overkill, but reduces accidental collisions.
	h := notsha256.Sum256([]byte(p))

				w.string(f.pkg.Path())
				w.string(" */ ")
			}
			if tag := t.Tag(i); tag != "" {
				w.byte(' ')
				// TODO(gri) If tag contains blanks, replacing them with '#'
				//           in Context.TypeHash may produce another tag
				//           accidentally.
				w.string(strconv.Quote(tag))
			}
		}
		w.byte('}')

	case *Pointer:
		w.byte('*')
		w.typ(t.base)

	case *Tuple:

				w.string(f.pkg.Path())
				w.string(" */ ")
			}
			if tag := t.Tag(i); tag != "" {
				w.byte(' ')
				// TODO(gri) If tag contains blanks, replacing them with '#'
				//           in Context.TypeHash may produce another tag
				//           accidentally.
				w.string(strconv.Quote(tag))
			}
		}
		w.byte('}')

	case *Pointer:
		w.byte('*')
		w.typ(t.base)

	case *Tuple:

				err.report()
				continue L
			}
		}
		seen[T] = e
		if x != nil && T != nil {
			check.typeAssertion(e, x, T, true)
		}
	}
	return
}

// TODO(gri) Once we are certain that typeHash is correct in all situations, use this version of caseTypes instead.
// (Currently it may be possible that different types have identical names and import paths due to ImporterFrom.)
//

				err.report()
				continue L
			}
		}
		seen[T] = e
		if x != nil && T != nil {
			check.typeAssertion(e, x, T, true)
		}
	}
	return
}

// TODO(gri) Once we are certain that typeHash is correct in all situations, use this version of caseTypes instead.
// (Currently it may be possible that different types have identical names and import paths due to ImporterFrom.)
//

					[]ir.Node{ir.NewTypeAssertExpr(c.pos, s.srcName, c.typ.Type())}) // iface.(type)
				nif := ir.NewIfStmt(c.pos, s.okName, []ir.Node{c.jmp}, nil)
				clauses = append(clauses, typeClause{
					hash: types.TypeHash(c.typ.Type()),
					body: []ir.Node{typecheck.Stmt(as), typecheck.Stmt(nif)},
				})
			}
			s.flush(clauses, &sw.Compiled)
			concreteCases = concreteCases[:0]
		}

}

type canString int

func (c canString) String() string {
	return fmt.Sprintf("%d", int(c))
}

func TestMapInterfaceKey(t *testing.T) {
	// Test all the special cases in runtime.typehash.
	type GrabBag struct {
		f32  float32
		f64  float64
		c64  complex64
		c128 complex128
		s    string
		i0   any
		i1   interface {
			String() string
		}
		a [4]string
	}