diff --git a/src/cmd/go.mod b/src/cmd/go.mod
index 6b2c45a9bb..4de382e0be 100644
--- a/src/cmd/go.mod
+++ b/src/cmd/go.mod
@@ -9,5 +9,5 @@ require (
 	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	golang.org/x/mod v0.1.1-0.20191029194233-18c3998b6452
 	golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82 // indirect
-	golang.org/x/tools v0.0.0-20191018203202-04252eccb9d5
+	golang.org/x/tools v0.0.0-20191104222624-6b7b8b79ae80
 )
diff --git a/src/cmd/go.sum b/src/cmd/go.sum
index 7fd4eaddad..85b5317b7f 100644
--- a/src/cmd/go.sum
+++ b/src/cmd/go.sum
@@ -18,8 +18,8 @@ golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82 h1:vsphBvatvfbhlb4PO1BYSr9dz
 golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20191018203202-04252eccb9d5 h1:TFUhCYbgGMOGnRxJv+j0iAcxCjk8oGjXXWNejQBhUUs=
-golang.org/x/tools v0.0.0-20191018203202-04252eccb9d5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191104222624-6b7b8b79ae80 h1:6CcDC1SXj4DrJP955osT9RJmKsH3LQBZJ59D5v4Rw0s=
+golang.org/x/tools v0.0.0-20191104222624-6b7b8b79ae80/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/analysis.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/analysis.go
index bc58c31c9f..ea605f4fd4 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/analysis.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/analysis.go
@@ -163,13 +163,19 @@ func (pass *Pass) Reportf(pos token.Pos, format string, args ...interface{}) {
 	pass.Report(Diagnostic{Pos: pos, Message: msg})
 }
 
-// reportNodef is a helper function that reports a Diagnostic using the
-// range denoted by the AST node.
-//
-// WARNING: This is an experimental API and may change in the future.
-func (pass *Pass) reportNodef(node ast.Node, format string, args ...interface{}) {
+// The Range interface provides a range. It's equivalent to and satisfied by
+// ast.Node.
+type Range interface {
+	Pos() token.Pos // position of first character belonging to the node
+	End() token.Pos // position of first character immediately after the node
+}
+
+// ReportRangef is a helper function that reports a Diagnostic using the
+// range provided. ast.Node values can be passed in as the range because
+// they satisfy the Range interface.
+func (pass *Pass) ReportRangef(rng Range, format string, args ...interface{}) {
 	msg := fmt.Sprintf(format, args...)
-	pass.Report(Diagnostic{Pos: node.Pos(), End: node.End(), Message: msg})
+	pass.Report(Diagnostic{Pos: rng.Pos(), End: rng.End(), Message: msg})
 }
 
 func (pass *Pass) String() string {
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/diagnostic.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/diagnostic.go
index 744072cd79..57eaf6faa2 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/diagnostic.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/diagnostic.go
@@ -22,6 +22,19 @@ type Diagnostic struct {
 	// Diagnostics should not contain SuggestedFixes that overlap.
 	// Experimental: This API is experimental and may change in the future.
 	SuggestedFixes []SuggestedFix // optional
+
+	// Experimental: This API is experimental and may change in the future.
+	Related []RelatedInformation // optional
+}
+
+// RelatedInformation contains information related to a diagnostic.
+// For example, a diagnostic that flags duplicated declarations of a
+// variable may include one RelatedInformation per existing
+// declaration.
+type RelatedInformation struct {
+	Pos     token.Pos
+	End     token.Pos
+	Message string
 }
 
 // A SuggestedFix is a code change associated with a Diagnostic that a user can choose
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/internal/facts/facts.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/internal/facts/facts.go
index 07984521c3..fe8e8f3884 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/internal/facts/facts.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/internal/facts/facts.go
@@ -101,11 +101,13 @@ func (s *Set) ExportObjectFact(obj types.Object, fact analysis.Fact) {
 
 func (s *Set) AllObjectFacts(filter map[reflect.Type]bool) []analysis.ObjectFact {
 	var facts []analysis.ObjectFact
+	s.mu.Lock()
 	for k, v := range s.m {
 		if k.obj != nil && filter[k.t] {
 			facts = append(facts, analysis.ObjectFact{Object: k.obj, Fact: v})
 		}
 	}
+	s.mu.Unlock()
 	return facts
 }
 
@@ -134,11 +136,13 @@ func (s *Set) ExportPackageFact(fact analysis.Fact) {
 
 func (s *Set) AllPackageFacts(filter map[reflect.Type]bool) []analysis.PackageFact {
 	var facts []analysis.PackageFact
+	s.mu.Lock()
 	for k, v := range s.m {
 		if k.obj == nil && filter[k.t] {
 			facts = append(facts, analysis.PackageFact{Package: k.pkg, Fact: v})
 		}
 	}
+	s.mu.Unlock()
 	return facts
 }
 
@@ -227,7 +231,6 @@ func Decode(pkg *types.Package, read func(packagePath string) ([]byte, error)) (
 // It may fail if one of the Facts could not be gob-encoded, but this is
 // a sign of a bug in an Analyzer.
 func (s *Set) Encode() []byte {
-
 	// TODO(adonovan): opt: use a more efficient encoding
 	// that avoids repeating PkgPath for each fact.
 
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/asmdecl/asmdecl.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/asmdecl/asmdecl.go
index 6e7a76e8c8..c2e89ee2dc 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/asmdecl/asmdecl.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/asmdecl/asmdecl.go
@@ -661,6 +661,10 @@ func asmCheckVar(badf func(string, ...interface{}), fn *asmFunc, line, expr stri
 				src = 4
 				break
 			}
+			if op == "MOVO" || op == "MOVOU" {
+				src = 16
+				break
+			}
 			if strings.HasPrefix(op, "SET") {
 				// SETEQ, etc
 				src = 1
@@ -736,6 +740,11 @@ func asmCheckVar(badf func(string, ...interface{}), fn *asmFunc, line, expr stri
 		vk = v.inner[0].kind
 		vs = v.inner[0].size
 		vt = v.inner[0].typ
+	case asmComplex:
+		// Allow a single instruction to load both parts of a complex.
+		if int(kind) == vs {
+			kind = asmComplex
+		}
 	}
 	if addr {
 		vk = asmKind(archDef.ptrSize)
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/atomic/atomic.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/atomic/atomic.go
index 45243d6f8c..9261db7e4e 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/atomic/atomic.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/atomic/atomic.go
@@ -91,6 +91,6 @@ func checkAtomicAddAssignment(pass *analysis.Pass, left ast.Expr, call *ast.Call
 	}
 
 	if broken {
-		pass.Reportf(left.Pos(), "direct assignment to atomic value")
+		pass.ReportRangef(left, "direct assignment to atomic value")
 	}
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/bools/bools.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/bools/bools.go
index c82d3675b9..fbc1f7ea91 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/bools/bools.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/bools/bools.go
@@ -100,7 +100,7 @@ func (op boolOp) checkRedundant(pass *analysis.Pass, exprs []ast.Expr) {
 	for _, e := range exprs {
 		efmt := analysisutil.Format(pass.Fset, e)
 		if seen[efmt] {
-			pass.Reportf(e.Pos(), "redundant %s: %s %s %s", op.name, efmt, op.tok, efmt)
+			pass.ReportRangef(e, "redundant %s: %s %s %s", op.name, efmt, op.tok, efmt)
 		} else {
 			seen[efmt] = true
 		}
@@ -147,7 +147,7 @@ func (op boolOp) checkSuspect(pass *analysis.Pass, exprs []ast.Expr) {
 		if prev, found := seen[xfmt]; found {
 			// checkRedundant handles the case in which efmt == prev.
 			if efmt != prev {
-				pass.Reportf(e.Pos(), "suspect %s: %s %s %s", op.name, efmt, op.tok, prev)
+				pass.ReportRangef(e, "suspect %s: %s %s %s", op.name, efmt, op.tok, prev)
 			}
 		} else {
 			seen[xfmt] = efmt
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/composite/composite.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/composite/composite.go
index 2abe7c6d51..4c3ac6647f 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/composite/composite.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/composite/composite.go
@@ -97,7 +97,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			return
 		}
 
-		pass.Reportf(cl.Pos(), "%s composite literal uses unkeyed fields", typeName)
+		pass.ReportRangef(cl, "%s composite literal uses unkeyed fields", typeName)
 	})
 	return nil, nil
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/copylock/copylock.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/copylock/copylock.go
index 067aed57df..c4ebf78571 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/copylock/copylock.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/copylock/copylock.go
@@ -74,7 +74,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 func checkCopyLocksAssign(pass *analysis.Pass, as *ast.AssignStmt) {
 	for i, x := range as.Rhs {
 		if path := lockPathRhs(pass, x); path != nil {
-			pass.Reportf(x.Pos(), "assignment copies lock value to %v: %v", analysisutil.Format(pass.Fset, as.Lhs[i]), path)
+			pass.ReportRangef(x, "assignment copies lock value to %v: %v", analysisutil.Format(pass.Fset, as.Lhs[i]), path)
 		}
 	}
 }
@@ -89,7 +89,7 @@ func checkCopyLocksGenDecl(pass *analysis.Pass, gd *ast.GenDecl) {
 		valueSpec := spec.(*ast.ValueSpec)
 		for i, x := range valueSpec.Values {
 			if path := lockPathRhs(pass, x); path != nil {
-				pass.Reportf(x.Pos(), "variable declaration copies lock value to %v: %v", valueSpec.Names[i].Name, path)
+				pass.ReportRangef(x, "variable declaration copies lock value to %v: %v", valueSpec.Names[i].Name, path)
 			}
 		}
 	}
@@ -102,7 +102,7 @@ func checkCopyLocksCompositeLit(pass *analysis.Pass, cl *ast.CompositeLit) {
 			x = node.Value
 		}
 		if path := lockPathRhs(pass, x); path != nil {
-			pass.Reportf(x.Pos(), "literal copies lock value from %v: %v", analysisutil.Format(pass.Fset, x), path)
+			pass.ReportRangef(x, "literal copies lock value from %v: %v", analysisutil.Format(pass.Fset, x), path)
 		}
 	}
 }
@@ -111,7 +111,7 @@ func checkCopyLocksCompositeLit(pass *analysis.Pass, cl *ast.CompositeLit) {
 func checkCopyLocksReturnStmt(pass *analysis.Pass, rs *ast.ReturnStmt) {
 	for _, x := range rs.Results {
 		if path := lockPathRhs(pass, x); path != nil {
-			pass.Reportf(x.Pos(), "return copies lock value: %v", path)
+			pass.ReportRangef(x, "return copies lock value: %v", path)
 		}
 	}
 }
@@ -133,7 +133,7 @@ func checkCopyLocksCallExpr(pass *analysis.Pass, ce *ast.CallExpr) {
 	}
 	for _, x := range ce.Args {
 		if path := lockPathRhs(pass, x); path != nil {
-			pass.Reportf(x.Pos(), "call of %s copies lock value: %v", analysisutil.Format(pass.Fset, ce.Fun), path)
+			pass.ReportRangef(x, "call of %s copies lock value: %v", analysisutil.Format(pass.Fset, ce.Fun), path)
 		}
 	}
 }
@@ -146,7 +146,7 @@ func checkCopyLocksFunc(pass *analysis.Pass, name string, recv *ast.FieldList, t
 	if recv != nil && len(recv.List) > 0 {
 		expr := recv.List[0].Type
 		if path := lockPath(pass.Pkg, pass.TypesInfo.Types[expr].Type); path != nil {
-			pass.Reportf(expr.Pos(), "%s passes lock by value: %v", name, path)
+			pass.ReportRangef(expr, "%s passes lock by value: %v", name, path)
 		}
 	}
 
@@ -154,7 +154,7 @@ func checkCopyLocksFunc(pass *analysis.Pass, name string, recv *ast.FieldList, t
 		for _, field := range typ.Params.List {
 			expr := field.Type
 			if path := lockPath(pass.Pkg, pass.TypesInfo.Types[expr].Type); path != nil {
-				pass.Reportf(expr.Pos(), "%s passes lock by value: %v", name, path)
+				pass.ReportRangef(expr, "%s passes lock by value: %v", name, path)
 			}
 		}
 	}
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/errorsas/errorsas.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/errorsas/errorsas.go
index 01abc70017..cd37407144 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/errorsas/errorsas.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/errorsas/errorsas.go
@@ -51,7 +51,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			return // not enough arguments, e.g. called with return values of another function
 		}
 		if fn.FullName() == "errors.As" && !pointerToInterfaceOrError(pass, call.Args[1]) {
-			pass.Reportf(call.Pos(), "second argument to errors.As must be a pointer to an interface or a type implementing error")
+			pass.ReportRangef(call, "second argument to errors.As must be a pointer to an interface or a type implementing error")
 		}
 	})
 	return nil, nil
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/httpresponse/httpresponse.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/httpresponse/httpresponse.go
index 0cf21b8cd1..ec335d3506 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/httpresponse/httpresponse.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/httpresponse/httpresponse.go
@@ -85,7 +85,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 		}
 
 		if resp.Obj == root.Obj {
-			pass.Reportf(root.Pos(), "using %s before checking for errors", resp.Name)
+			pass.ReportRangef(root, "using %s before checking for errors", resp.Name)
 		}
 		return true
 	})
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/inspect/inspect.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/inspect/inspect.go
index 8213f63313..2856df137c 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/inspect/inspect.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/inspect/inspect.go
@@ -16,7 +16,7 @@
 //
 //	var Analyzer = &analysis.Analyzer{
 //		...
-//		Requires:       reflect.TypeOf(new(inspect.Analyzer)),
+//		Requires:       []*analysis.Analyzer{inspect.Analyzer},
 //	}
 //
 // 	func run(pass *analysis.Pass) (interface{}, error) {
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/loopclosure/loopclosure.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/loopclosure/loopclosure.go
index da0714069f..a14e7eb55d 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/loopclosure/loopclosure.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/loopclosure/loopclosure.go
@@ -119,7 +119,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			}
 			for _, v := range vars {
 				if v.Obj == id.Obj {
-					pass.Reportf(id.Pos(), "loop variable %s captured by func literal",
+					pass.ReportRangef(id, "loop variable %s captured by func literal",
 						id.Name)
 				}
 			}
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/lostcancel/lostcancel.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/lostcancel/lostcancel.go
index e88cf57d8f..85e7ba7a8e 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/lostcancel/lostcancel.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/lostcancel/lostcancel.go
@@ -121,7 +121,7 @@ func runFunc(pass *analysis.Pass, node ast.Node) {
 		}
 		if id != nil {
 			if id.Name == "_" {
-				pass.Reportf(id.Pos(),
+				pass.ReportRangef(id,
 					"the cancel function returned by context.%s should be called, not discarded, to avoid a context leak",
 					n.(*ast.SelectorExpr).Sel.Name)
 			} else if v, ok := pass.TypesInfo.Uses[id].(*types.Var); ok {
@@ -174,8 +174,8 @@ func runFunc(pass *analysis.Pass, node ast.Node) {
 	for v, stmt := range cancelvars {
 		if ret := lostCancelPath(pass, g, v, stmt, sig); ret != nil {
 			lineno := pass.Fset.Position(stmt.Pos()).Line
-			pass.Reportf(stmt.Pos(), "the %s function is not used on all paths (possible context leak)", v.Name())
-			pass.Reportf(ret.Pos(), "this return statement may be reached without using the %s var defined on line %d", v.Name(), lineno)
+			pass.ReportRangef(stmt, "the %s function is not used on all paths (possible context leak)", v.Name())
+			pass.ReportRangef(ret, "this return statement may be reached without using the %s var defined on line %d", v.Name(), lineno)
 		}
 	}
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/nilfunc/nilfunc.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/nilfunc/nilfunc.go
index 9c2d4df20a..cd42c9897f 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/nilfunc/nilfunc.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/nilfunc/nilfunc.go
@@ -68,7 +68,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 			return
 		}
 
-		pass.Reportf(e.Pos(), "comparison of function %v %v nil is always %v", obj.Name(), e.Op, e.Op == token.NEQ)
+		pass.ReportRangef(e, "comparison of function %v %v nil is always %v", obj.Name(), e.Op, e.Op == token.NEQ)
 	})
 	return nil, nil
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/printf/printf.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/printf/printf.go
index b501538055..38a752c957 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/printf/printf.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/printf/printf.go
@@ -13,6 +13,7 @@ import (
 	"go/constant"
 	"go/token"
 	"go/types"
+	"reflect"
 	"regexp"
 	"sort"
 	"strconv"
@@ -31,11 +32,12 @@ func init() {
 }
 
 var Analyzer = &analysis.Analyzer{
-	Name:      "printf",
-	Doc:       doc,
-	Requires:  []*analysis.Analyzer{inspect.Analyzer},
-	Run:       run,
-	FactTypes: []analysis.Fact{new(isWrapper)},
+	Name:       "printf",
+	Doc:        doc,
+	Requires:   []*analysis.Analyzer{inspect.Analyzer},
+	Run:        run,
+	ResultType: reflect.TypeOf((*Result)(nil)),
+	FactTypes:  []analysis.Fact{new(isWrapper)},
 }
 
 const doc = `check consistency of Printf format strings and arguments
@@ -66,18 +68,64 @@ argument list. Otherwise it is assumed to be Print-like, taking a list
 of arguments with no format string.
 `
 
+// Kind is a kind of fmt function behavior.
+type Kind int
+
+const (
+	KindNone   Kind = iota // not a fmt wrapper function
+	KindPrint              // function behaves like fmt.Print
+	KindPrintf             // function behaves like fmt.Printf
+	KindErrorf             // function behaves like fmt.Errorf
+)
+
+func (kind Kind) String() string {
+	switch kind {
+	case KindPrint:
+		return "print"
+	case KindPrintf:
+		return "printf"
+	case KindErrorf:
+		return "errorf"
+	}
+	return ""
+}
+
+// Result is the printf analyzer's result type. Clients may query the result
+// to learn whether a function behaves like fmt.Print or fmt.Printf.
+type Result struct {
+	funcs map[*types.Func]Kind
+}
+
+// Kind reports whether fn behaves like fmt.Print or fmt.Printf.
+func (r *Result) Kind(fn *types.Func) Kind {
+	_, ok := isPrint[fn.FullName()]
+	if !ok {
+		// Next look up just "printf", for use with -printf.funcs.
+		_, ok = isPrint[strings.ToLower(fn.Name())]
+	}
+	if ok {
+		if strings.HasSuffix(fn.Name(), "f") {
+			return KindPrintf
+		} else {
+			return KindPrint
+		}
+	}
+
+	return r.funcs[fn]
+}
+
 // isWrapper is a fact indicating that a function is a print or printf wrapper.
-type isWrapper struct{ Kind funcKind }
+type isWrapper struct{ Kind Kind }
 
 func (f *isWrapper) AFact() {}
 
 func (f *isWrapper) String() string {
 	switch f.Kind {
-	case kindPrintf:
+	case KindPrintf:
 		return "printfWrapper"
-	case kindPrint:
+	case KindPrint:
 		return "printWrapper"
-	case kindErrorf:
+	case KindErrorf:
 		return "errorfWrapper"
 	default:
 		return "unknownWrapper"
@@ -85,9 +133,12 @@ func (f *isWrapper) String() string {
 }
 
 func run(pass *analysis.Pass) (interface{}, error) {
-	findPrintfLike(pass)
+	res := &Result{
+		funcs: make(map[*types.Func]Kind),
+	}
+	findPrintfLike(pass, res)
 	checkCall(pass)
-	return nil, nil
+	return res, nil
 }
 
 type printfWrapper struct {
@@ -154,7 +205,7 @@ func maybePrintfWrapper(info *types.Info, decl ast.Decl) *printfWrapper {
 }
 
 // findPrintfLike scans the entire package to find printf-like functions.
-func findPrintfLike(pass *analysis.Pass) (interface{}, error) {
+func findPrintfLike(pass *analysis.Pass, res *Result) (interface{}, error) {
 	// Gather potential wrappers and call graph between them.
 	byObj := make(map[*types.Func]*printfWrapper)
 	var wrappers []*printfWrapper
@@ -209,7 +260,7 @@ func findPrintfLike(pass *analysis.Pass) (interface{}, error) {
 
 			fn, kind := printfNameAndKind(pass, call)
 			if kind != 0 {
-				checkPrintfFwd(pass, w, call, kind)
+				checkPrintfFwd(pass, w, call, kind, res)
 				return true
 			}
 
@@ -232,20 +283,11 @@ func match(info *types.Info, arg ast.Expr, param *types.Var) bool {
 	return ok && info.ObjectOf(id) == param
 }
 
-type funcKind int
-
-const (
-	kindUnknown funcKind = iota
-	kindPrintf           = iota
-	kindPrint
-	kindErrorf
-)
-
 // checkPrintfFwd checks that a printf-forwarding wrapper is forwarding correctly.
 // It diagnoses writing fmt.Printf(format, args) instead of fmt.Printf(format, args...).
-func checkPrintfFwd(pass *analysis.Pass, w *printfWrapper, call *ast.CallExpr, kind funcKind) {
-	matched := kind == kindPrint ||
-		kind != kindUnknown && len(call.Args) >= 2 && match(pass.TypesInfo, call.Args[len(call.Args)-2], w.format)
+func checkPrintfFwd(pass *analysis.Pass, w *printfWrapper, call *ast.CallExpr, kind Kind, res *Result) {
+	matched := kind == KindPrint ||
+		kind != KindNone && len(call.Args) >= 2 && match(pass.TypesInfo, call.Args[len(call.Args)-2], w.format)
 	if !matched {
 		return
 	}
@@ -266,10 +308,10 @@ func checkPrintfFwd(pass *analysis.Pass, w *printfWrapper, call *ast.CallExpr, k
 			return
 		}
 		desc := "printf"
-		if kind == kindPrint {
+		if kind == KindPrint {
 			desc = "print"
 		}
-		pass.Reportf(call.Pos(), "missing ... in args forwarded to %s-like function", desc)
+		pass.ReportRangef(call, "missing ... in args forwarded to %s-like function", desc)
 		return
 	}
 	fn := w.obj
@@ -277,8 +319,9 @@ func checkPrintfFwd(pass *analysis.Pass, w *printfWrapper, call *ast.CallExpr, k
 	if !pass.ImportObjectFact(fn, &fact) {
 		fact.Kind = kind
 		pass.ExportObjectFact(fn, &fact)
+		res.funcs[fn] = kind
 		for _, caller := range w.callers {
-			checkPrintfFwd(pass, caller.w, caller.call, kind)
+			checkPrintfFwd(pass, caller.w, caller.call, kind, res)
 		}
 	}
 }
@@ -427,15 +470,15 @@ func checkCall(pass *analysis.Pass) {
 		call := n.(*ast.CallExpr)
 		fn, kind := printfNameAndKind(pass, call)
 		switch kind {
-		case kindPrintf, kindErrorf:
+		case KindPrintf, KindErrorf:
 			checkPrintf(pass, kind, call, fn)
-		case kindPrint:
+		case KindPrint:
 			checkPrint(pass, call, fn)
 		}
 	})
 }
 
-func printfNameAndKind(pass *analysis.Pass, call *ast.CallExpr) (fn *types.Func, kind funcKind) {
+func printfNameAndKind(pass *analysis.Pass, call *ast.CallExpr) (fn *types.Func, kind Kind) {
 	fn, _ = typeutil.Callee(pass.TypesInfo, call).(*types.Func)
 	if fn == nil {
 		return nil, 0
@@ -448,11 +491,11 @@ func printfNameAndKind(pass *analysis.Pass, call *ast.CallExpr) (fn *types.Func,
 	}
 	if ok {
 		if fn.Name() == "Errorf" {
-			kind = kindErrorf
+			kind = KindErrorf
 		} else if strings.HasSuffix(fn.Name(), "f") {
-			kind = kindPrintf
+			kind = KindPrintf
 		} else {
-			kind = kindPrint
+			kind = KindPrint
 		}
 		return fn, kind
 	}
@@ -462,7 +505,7 @@ func printfNameAndKind(pass *analysis.Pass, call *ast.CallExpr) (fn *types.Func,
 		return fn, fact.Kind
 	}
 
-	return fn, kindUnknown
+	return fn, KindNone
 }
 
 // isFormatter reports whether t satisfies fmt.Formatter.
@@ -504,7 +547,7 @@ type formatState struct {
 }
 
 // checkPrintf checks a call to a formatted print routine such as Printf.
-func checkPrintf(pass *analysis.Pass, kind funcKind, call *ast.CallExpr, fn *types.Func) {
+func checkPrintf(pass *analysis.Pass, kind Kind, call *ast.CallExpr, fn *types.Func) {
 	format, idx := formatString(pass, call)
 	if idx < 0 {
 		if false {
@@ -542,7 +585,7 @@ func checkPrintf(pass *analysis.Pass, kind funcKind, call *ast.CallExpr, fn *typ
 			anyIndex = true
 		}
 		if state.verb == 'w' {
-			if kind != kindErrorf {
+			if kind != KindErrorf {
 				pass.Reportf(call.Pos(), "%s call has error-wrapping directive %%w", state.name)
 				return
 			}
@@ -574,7 +617,7 @@ func checkPrintf(pass *analysis.Pass, kind funcKind, call *ast.CallExpr, fn *typ
 	if maxArgNum != len(call.Args) {
 		expect := maxArgNum - firstArg
 		numArgs := len(call.Args) - firstArg
-		pass.Reportf(call.Pos(), "%s call needs %v but has %v", fn.Name(), count(expect, "arg"), count(numArgs, "arg"))
+		pass.ReportRangef(call, "%s call needs %v but has %v", fn.Name(), count(expect, "arg"), count(numArgs, "arg"))
 	}
 }
 
@@ -615,13 +658,13 @@ func (s *formatState) parseIndex() bool {
 		ok = false
 		s.nbytes = strings.Index(s.format, "]")
 		if s.nbytes < 0 {
-			s.pass.Reportf(s.call.Pos(), "%s format %s is missing closing ]", s.name, s.format)
+			s.pass.ReportRangef(s.call, "%s format %s is missing closing ]", s.name, s.format)
 			return false
 		}
 	}
 	arg32, err := strconv.ParseInt(s.format[start:s.nbytes], 10, 32)
 	if err != nil || !ok || arg32 <= 0 || arg32 > int64(len(s.call.Args)-s.firstArg) {
-		s.pass.Reportf(s.call.Pos(), "%s format has invalid argument index [%s]", s.name, s.format[start:s.nbytes])
+		s.pass.ReportRangef(s.call, "%s format has invalid argument index [%s]", s.name, s.format[start:s.nbytes])
 		return false
 	}
 	s.nbytes++ // skip ']'
@@ -698,7 +741,7 @@ func parsePrintfVerb(pass *analysis.Pass, call *ast.CallExpr, name, format strin
 		return nil
 	}
 	if state.nbytes == len(state.format) {
-		pass.Reportf(call.Pos(), "%s format %s is missing verb at end of string", name, state.format)
+		pass.ReportRangef(call.Fun, "%s format %s is missing verb at end of string", name, state.format)
 		return nil
 	}
 	verb, w := utf8.DecodeRuneInString(state.format[state.nbytes:])
@@ -748,7 +791,7 @@ var printVerbs = []printVerb{
 	// '#' is alternate format for several verbs.
 	// ' ' is spacer for numbers
 	{'%', noFlag, 0},
-	{'b', numFlag, argInt | argFloat | argComplex | argPointer},
+	{'b', sharpNumFlag, argInt | argFloat | argComplex | argPointer},
 	{'c', "-", argRune | argInt},
 	{'d', numFlag, argInt | argPointer},
 	{'e', sharpNumFlag, argFloat | argComplex},
@@ -794,7 +837,7 @@ func okPrintfArg(pass *analysis.Pass, call *ast.CallExpr, state *formatState) (o
 
 	if !formatter {
 		if !found {
-			pass.Reportf(call.Pos(), "%s format %s has unknown verb %c", state.name, state.format, state.verb)
+			pass.ReportRangef(call, "%s format %s has unknown verb %c", state.name, state.format, state.verb)
 			return false
 		}
 		for _, flag := range state.flags {
@@ -804,7 +847,7 @@ func okPrintfArg(pass *analysis.Pass, call *ast.CallExpr, state *formatState) (o
 				continue
 			}
 			if !strings.ContainsRune(v.flags, rune(flag)) {
-				pass.Reportf(call.Pos(), "%s format %s has unrecognized flag %c", state.name, state.format, flag)
+				pass.ReportRangef(call, "%s format %s has unrecognized flag %c", state.name, state.format, flag)
 				return false
 			}
 		}
@@ -823,7 +866,7 @@ func okPrintfArg(pass *analysis.Pass, call *ast.CallExpr, state *formatState) (o
 		}
 		arg := call.Args[argNum]
 		if !matchArgType(pass, argInt, nil, arg) {
-			pass.Reportf(call.Pos(), "%s format %s uses non-int %s as argument of *", state.name, state.format, analysisutil.Format(pass.Fset, arg))
+			pass.ReportRangef(call, "%s format %s uses non-int %s as argument of *", state.name, state.format, analysisutil.Format(pass.Fset, arg))
 			return false
 		}
 	}
@@ -837,7 +880,7 @@ func okPrintfArg(pass *analysis.Pass, call *ast.CallExpr, state *formatState) (o
 	}
 	arg := call.Args[argNum]
 	if isFunctionValue(pass, arg) && state.verb != 'p' && state.verb != 'T' {
-		pass.Reportf(call.Pos(), "%s format %s arg %s is a func value, not called", state.name, state.format, analysisutil.Format(pass.Fset, arg))
+		pass.ReportRangef(call, "%s format %s arg %s is a func value, not called", state.name, state.format, analysisutil.Format(pass.Fset, arg))
 		return false
 	}
 	if !matchArgType(pass, v.typ, nil, arg) {
@@ -845,11 +888,11 @@ func okPrintfArg(pass *analysis.Pass, call *ast.CallExpr, state *formatState) (o
 		if typ := pass.TypesInfo.Types[arg].Type; typ != nil {
 			typeString = typ.String()
 		}
-		pass.Reportf(call.Pos(), "%s format %s has arg %s of wrong type %s", state.name, state.format, analysisutil.Format(pass.Fset, arg), typeString)
+		pass.ReportRangef(call, "%s format %s has arg %s of wrong type %s", state.name, state.format, analysisutil.Format(pass.Fset, arg), typeString)
 		return false
 	}
 	if v.typ&argString != 0 && v.verb != 'T' && !bytes.Contains(state.flags, []byte{'#'}) && recursiveStringer(pass, arg) {
-		pass.Reportf(call.Pos(), "%s format %s with arg %s causes recursive String method call", state.name, state.format, analysisutil.Format(pass.Fset, arg))
+		pass.ReportRangef(call, "%s format %s with arg %s causes recursive String method call", state.name, state.format, analysisutil.Format(pass.Fset, arg))
 		return false
 	}
 	return true
@@ -935,7 +978,7 @@ func argCanBeChecked(pass *analysis.Pass, call *ast.CallExpr, formatArg int, sta
 	// There are bad indexes in the format or there are fewer arguments than the format needs.
 	// This is the argument number relative to the format: Printf("%s", "hi") will give 1 for the "hi".
 	arg := argNum - state.firstArg + 1 // People think of arguments as 1-indexed.
-	pass.Reportf(call.Pos(), "%s format %s reads arg #%d, but call has %v", state.name, state.format, arg, count(len(call.Args)-state.firstArg, "arg"))
+	pass.ReportRangef(call, "%s format %s reads arg #%d, but call has %v", state.name, state.format, arg, count(len(call.Args)-state.firstArg, "arg"))
 	return false
 }
 
@@ -986,7 +1029,7 @@ func checkPrint(pass *analysis.Pass, call *ast.CallExpr, fn *types.Func) {
 		if sel, ok := call.Args[0].(*ast.SelectorExpr); ok {
 			if x, ok := sel.X.(*ast.Ident); ok {
 				if x.Name == "os" && strings.HasPrefix(sel.Sel.Name, "Std") {
-					pass.Reportf(call.Pos(), "%s does not take io.Writer but has first arg %s", fn.Name(), analysisutil.Format(pass.Fset, call.Args[0]))
+					pass.ReportRangef(call, "%s does not take io.Writer but has first arg %s", fn.Name(), analysisutil.Format(pass.Fset, call.Args[0]))
 				}
 			}
 		}
@@ -1000,7 +1043,7 @@ func checkPrint(pass *analysis.Pass, call *ast.CallExpr, fn *types.Func) {
 		if strings.Contains(s, "%") {
 			m := printFormatRE.FindStringSubmatch(s)
 			if m != nil {
-				pass.Reportf(call.Pos(), "%s call has possible formatting directive %s", fn.Name(), m[0])
+				pass.ReportRangef(call, "%s call has possible formatting directive %s", fn.Name(), m[0])
 			}
 		}
 	}
@@ -1010,16 +1053,16 @@ func checkPrint(pass *analysis.Pass, call *ast.CallExpr, fn *types.Func) {
 		if lit, ok := arg.(*ast.BasicLit); ok && lit.Kind == token.STRING {
 			str, _ := strconv.Unquote(lit.Value)
 			if strings.HasSuffix(str, "\n") {
-				pass.Reportf(call.Pos(), "%s arg list ends with redundant newline", fn.Name())
+				pass.ReportRangef(call, "%s arg list ends with redundant newline", fn.Name())
 			}
 		}
 	}
 	for _, arg := range args {
 		if isFunctionValue(pass, arg) {
-			pass.Reportf(call.Pos(), "%s arg %s is a func value, not called", fn.Name(), analysisutil.Format(pass.Fset, arg))
+			pass.ReportRangef(call, "%s arg %s is a func value, not called", fn.Name(), analysisutil.Format(pass.Fset, arg))
 		}
 		if recursiveStringer(pass, arg) {
-			pass.Reportf(call.Pos(), "%s arg %s causes recursive call to String method", fn.Name(), analysisutil.Format(pass.Fset, arg))
+			pass.ReportRangef(call, "%s arg %s causes recursive call to String method", fn.Name(), analysisutil.Format(pass.Fset, arg))
 		}
 	}
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/shift/shift.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/shift/shift.go
index 39f54573c9..0db95dafb0 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/shift/shift.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/shift/shift.go
@@ -94,6 +94,6 @@ func checkLongShift(pass *analysis.Pass, node ast.Node, x, y ast.Expr) {
 	size := 8 * pass.TypesSizes.Sizeof(t)
 	if amt >= size {
 		ident := analysisutil.Format(pass.Fset, x)
-		pass.Reportf(node.Pos(), "%s (%d bits) too small for shift of %d", ident, size, amt)
+		pass.ReportRangef(node, "%s (%d bits) too small for shift of %d", ident, size, amt)
 	}
 }
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/stdmethods/stdmethods.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/stdmethods/stdmethods.go
index bc1db7e4c2..856c6ae0d8 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/stdmethods/stdmethods.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/stdmethods/stdmethods.go
@@ -141,7 +141,7 @@ func canonicalMethod(pass *analysis.Pass, id *ast.Ident) {
 		actual = strings.TrimPrefix(actual, "func")
 		actual = id.Name + actual
 
-		pass.Reportf(id.Pos(), "method %s should have signature %s", actual, expectFmt)
+		pass.ReportRangef(id, "method %s should have signature %s", actual, expectFmt)
 	}
 }
 
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unreachable/unreachable.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unreachable/unreachable.go
index 19bc9c2db9..089c064838 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unreachable/unreachable.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unreachable/unreachable.go
@@ -189,7 +189,7 @@ func (d *deadState) findDead(stmt ast.Stmt) {
 		case *ast.EmptyStmt:
 			// do not warn about unreachable empty statements
 		default:
-			d.pass.Reportf(stmt.Pos(), "unreachable code")
+			d.pass.ReportRangef(stmt, "unreachable code")
 			d.reachable = true // silence error about next statement
 		}
 	}
diff --git a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unsafeptr/unsafeptr.go b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unsafeptr/unsafeptr.go
index 308bfc69cb..d5bafb859d 100644
--- a/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unsafeptr/unsafeptr.go
+++ b/src/cmd/vendor/golang.org/x/tools/go/analysis/passes/unsafeptr/unsafeptr.go
@@ -45,7 +45,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
 		if hasBasicType(pass.TypesInfo, x.Fun, types.UnsafePointer) &&
 			hasBasicType(pass.TypesInfo, x.Args[0], types.Uintptr) &&
 			!isSafeUintptr(pass.TypesInfo, x.Args[0]) {
-			pass.Reportf(x.Pos(), "possible misuse of unsafe.Pointer")
+			pass.ReportRangef(x, "possible misuse of unsafe.Pointer")
 		}
 	})
 	return nil, nil
diff --git a/src/cmd/vendor/modules.txt b/src/cmd/vendor/modules.txt
index 6cc6ed87fa..7bca3d0d3d 100644
--- a/src/cmd/vendor/modules.txt
+++ b/src/cmd/vendor/modules.txt
@@ -43,7 +43,7 @@ golang.org/x/mod/sumdb/tlog
 ## explicit
 golang.org/x/sys/unix
 golang.org/x/sys/windows
-# golang.org/x/tools v0.0.0-20191018203202-04252eccb9d5
+# golang.org/x/tools v0.0.0-20191104222624-6b7b8b79ae80
 ## explicit
 golang.org/x/tools/go/analysis
 golang.org/x/tools/go/analysis/internal/analysisflags