if src.IsChan() && src.ChanDir() == types.Cboth && dst.IsChan() {
		if types.Identical(src.Elem(), dst.Elem()) && (src.Sym() == nil || dst.Sym() == nil) {
			return ir.OCONVNOP, ""
		}
	}

	// 5. src is the predeclared identifier nil and dst is a nillable type.
	if src.Kind() == types.TNIL {
		switch dst.Kind() {
		case types.TPTR,
			types.TFUNC,
			types.TMAP,
			types.TCHAN,
			types.TINTER,
			types.TSLICE:

	default:
		n.SetOp(ir.OCALLFUNC)
		if t.Kind() != types.TFUNC {
			if o := l; o.Name() != nil && types.BuiltinPkg.Lookup(o.Sym().Name).Def != nil {
				// be more specific when the non-function
				// name matches a predeclared function
				base.Errorf("cannot call non-function %L, declared at %s",
					l, base.FmtPos(o.Name().Pos()))
			} else {
				base.Errorf("cannot call non-function %L", l)
			}
			n.SetType(nil)
			return n

					err.report()
					continue L
				}
			}
			seen[val] = append(seen[val], valueType{v.Pos(), v.typ})
		}
	}
}

// isNil reports whether the expression e denotes the predeclared value nil.
func (check *Checker) isNil(e ast.Expr) bool {
	// The only way to express the nil value is by literally writing nil (possibly in parentheses).
	if name, _ := ast.Unparen(e).(*ast.Ident); name != nil {

					err.report()
					continue L
				}
			}
			seen[val] = append(seen[val], valueType{v.Pos(), v.typ})
		}
	}
}

// isNil reports whether the expression e denotes the predeclared value nil.
func (check *Checker) isNil(e syntax.Expr) bool {
	// The only way to express the nil value is by literally writing nil (possibly in parentheses).
	if name, _ := syntax.Unparen(e).(*syntax.Name); name != nil {

github.com/nishanths/exhaustive v0.12.0/go.mod h1:mEZ95wPIZW+x8kC4TgC+9YCUgiST7ecevsVDTgc2obs=
github.com/nishanths/predeclared v0.2.2 h1:V2EPdZPliZymNAn79T8RkNApBjMmVKh5XRpLm/w98Vk=
github.com/nishanths/predeclared v0.2.2/go.mod h1:RROzoN6TnGQupbC+lqggsOlcgysk3LMK/HI84Mp280c=
github.com/nunnatsa/ginkgolinter v0.15.2 h1:N2ORxUxPU56R9gsfLIlVVvCv/V/VVou5qVI1oBKBNHg=

<h3 id="symbols">Symbols</h3>

<p>
Some symbols, such as <code>R1</code> or <code>LR</code>,
are predefined and refer to registers.
The exact set depends on the architecture.
</p>

<p>
There are four predeclared symbols that refer to pseudo-registers.
These are not real registers, but rather virtual registers maintained by
the toolchain, such as a frame pointer.
The set of pseudo-registers is the same for all architectures:
</p>

				fn(i, n.Name, r.Type)
				i++
			}
		}
	}
}

func c(repr string, args ...interface{}) *TypeRepr {
	return &TypeRepr{repr, args}
}

// Map predeclared Go types to Type.
var goTypes = map[string]*Type{
	"bool":       {Size: 1, Align: 1, C: c("GoUint8")},
	"byte":       {Size: 1, Align: 1, C: c("GoUint8")},
	"int":        {Size: 0, Align: 0, C: c("GoInt")},

	F2 func(x, y, z float32)
	F3 func(x, y, x /* ERROR "redeclared" */ float32)
	F4 func() (x, y, x /* ERROR "redeclared" */ float32)
	F5 func(x int) (x /* ERROR "redeclared" */ float32)
	F6 func(x ...int)

	I1 interface{}
	I2 interface {
		m1()
	}
	I3 interface {
		m1()
		m1 /* ERROR "duplicate method m1" */ ()
	}
	I4 interface {
		m1(x, y, x /* ERROR "redeclared" */ float32)

	return t.x
}

func f() {
	var t *T6
	t.m1()
}

// Double declarations across package files
const c_double /* ERROR "redeclared" */ = 0
type t_double  /* ERROR "redeclared" */ int
var v_double /* ERROR "redeclared" */ int
func f_double /* ERROR "redeclared" */ () {}

// Blank methods need to be type-checked.
// Verify by checking that errors are reported.
func (T /* ERROR "undefined" */ ) _() {}

func (t *T) H() {} // ERROR "already declared|redefinition"

func f(int, string)  // GCCGO_ERROR "previous"
func f(int, float64) {} // ERROR "redeclared|redefinition"

func g(a int, b string) // GCCGO_ERROR "previous"