# Set up shared custom sources
apt-get update
apt-get install -y gnupg ca-certificates

# Deadsnakes: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F23C5A6CF475977595C89F51BA6932366A755776

# LLVM/Clang: https://apt.llvm.org/
apt-key adv --fetch-keys https://apt.llvm.org/llvm-snapshot.gpg.key

# Set up custom sources

// refer to receiver type parameters, as is the case for the 'P' result
// parameter below.
//
// For now, we ensure that types are not incorrectly resolved when receiver
// type parameters are in scope.
func (r /* =@recv */ Receiver /* @Receiver */ [RP]) m(RP) RP {}

func f /* =@f */[T1 /* =@T1 */ interface{~[]T2 /* @T2 */}, T2 /* =@T2 */ any](
  x /* =@x */ T1 /* @T1 */, T1 /* =@T1_duplicate */ y,  // Note that this is a bug:

		t.Fatal(err)
	}
	res, err := downstream.Recv()
	if err != nil {
		t.Fatal(err)
	}
	if res == nil || res.TypeUrl != v3.ClusterType {
		t.Fatalf("Expected to get cluster response but got %v", res)
	}
	err = downstream.Send(&discovery.DiscoveryRequest{TypeUrl: v3.ListenerType, Node: node})
	if err != nil {
		t.Fatal(err)
	}
	res, err = downstream.Recv()
	if err != nil {
		t.Fatal(err)
	}

	StringLit
)

type Operator uint

//go:generate stringer -type Operator -linecomment tokens.go

const (
	_ Operator = iota

	// Def is the : in :=
	Def   // :
	Not   // !
	Recv  // <-
	Tilde // ~

	// precOrOr
	OrOr // ||

	// precAndAnd
	AndAnd // &&

	// precCmp
	Eql // ==
	Neq // !=
	Lss // <
	Leq // <=
	Gtr // >
	Geq // >=

func isMethodNamed(f *types.Func, pkgPath string, names ...string) bool {
	if f == nil {
		return false
	}
	if f.Pkg() == nil || f.Pkg().Path() != pkgPath {
		return false
	}
	if f.Type().(*types.Signature).Recv() == nil {
		return false
	}
	for _, n := range names {
		if f.Name() == n {
			return true
		}
	}
	return false
}

func funcIdent(fun ast.Expr) *ast.Ident {

			}
			if !cas.recv.IsValid() {
				t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i)
			}
			if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed {
				if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed {

				// Turn a method receiver:  func (T) f(P) R {...}
				// into regular parameter:  func _(T, P) R {...}
				if decl.Recv != nil {
					var params []*ast.Field
					params = append(params, decl.Recv.List...)
					params = append(params, decl.Type.Params.List...)
					decl.Type.Params.List = params
					decl.Recv = nil
				}
			}
			decls = append(decls, decl)
		}
		f.Decls = decls
		if debug {

		}
		if len(t.AllMethods()) != 0 {
			b.WriteByte(' ')
		}
		b.WriteByte('}')

	case TFUNC:
		if verb == 'S' {
			// no leading func
		} else {
			if t.Recv() != nil {
				b.WriteString("method")
				formatParams(b, t.Recvs(), mode, visited)
				b.WriteByte(' ')
			}
			b.WriteString("func")
		}
		formatParams(b, t.Params(), mode, visited)

		switch t.NumResults() {
		case 0:

		// nothing to do

	case *GenDecl:
		if n.Doc != nil {
			Walk(v, n.Doc)
		}
		walkList(v, n.Specs)

	case *FuncDecl:
		if n.Doc != nil {
			Walk(v, n.Doc)
		}
		if n.Recv != nil {
			Walk(v, n.Recv)
		}
		Walk(v, n.Name)
		Walk(v, n.Type)
		if n.Body != nil {
			Walk(v, n.Body)
		}

	// Files and packages
	case *File:
		if n.Doc != nil {
			Walk(v, n.Doc)
		}

	default:
		as.Y = walkExpr(as.Y, init)

	case ir.ORECV:
		// x = <-c; as.Left is x, as.Right.Left is c.
		// order.stmt made sure x is addressable.
		recv := as.Y.(*ir.UnaryExpr)
		recv.X = walkExpr(recv.X, init)

		n1 := typecheck.NodAddr(as.X)
		r := recv.X // the channel
		return mkcall1(chanfn("chanrecv1", 2, r.Type()), nil, init, r, n1)

	case ir.OAPPEND:
		// x = append(...)
		call := as.Y.(*ir.CallExpr)