diff --git a/src/cmd/compile/internal/gc/main.go b/src/cmd/compile/internal/gc/main.go
index 3803417cea..db7c76231a 100644
--- a/src/cmd/compile/internal/gc/main.go
+++ b/src/cmd/compile/internal/gc/main.go
@@ -181,7 +181,7 @@ func Main() {
 	obj.Flagcount("live", "debug liveness analysis", &debuglive)
 	obj.Flagcount("m", "print optimization decisions", &Debug['m'])
 	flag.BoolVar(&flag_msan, "msan", false, "build code compatible with C/C++ memory sanitizer")
-	flag.BoolVar(&flag_newparser, "newparser", false, "use new parser")
+	flag.BoolVar(&flag_newparser, "newparser", true, "use new parser")
 	flag.BoolVar(&nolocalimports, "nolocalimports", false, "reject local (relative) imports")
 	flag.StringVar(&outfile, "o", "", "write output to `file`")
 	flag.StringVar(&myimportpath, "p", "", "set expected package import `path`")
diff --git a/src/cmd/compile/internal/gc/noder.go b/src/cmd/compile/internal/gc/noder.go
index 6dc082410f..3cfd1cad20 100644
--- a/src/cmd/compile/internal/gc/noder.go
+++ b/src/cmd/compile/internal/gc/noder.go
@@ -578,6 +578,7 @@ func (p *noder) structType(expr *syntax.StructType) *Node {
 		l = append(l, n)
 	}
 
+	p.lineno(expr)
 	n := p.nod(expr, OTSTRUCT, nil, nil)
 	n.List.Set(l)
 	return n
diff --git a/src/go/types/stdlib_test.go b/src/go/types/stdlib_test.go
index 0fdd495735..4192a3608e 100644
--- a/src/go/types/stdlib_test.go
+++ b/src/go/types/stdlib_test.go
@@ -100,9 +100,7 @@ func testTestDir(t *testing.T, path string, ignore ...string) {
 			switch cmd {
 			case "skip", "compiledir":
 				continue // ignore this file
-			// TODO(mdempsky): Remove -newparser=0 case once
-			// test/fixedbugs/issue11610.go is updated.
-			case "errorcheck", "errorcheck -newparser=0":
+			case "errorcheck":
 				expectErrors = true
 			}
 		}
diff --git a/test/alias2.go b/test/alias2.go
index b73f81c014..a09f524611 100644
--- a/test/alias2.go
+++ b/test/alias2.go
@@ -1,4 +1,4 @@
-// errorcheck -newparser=1
+// errorcheck
 
 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
diff --git a/test/fixedbugs/issue11610.go b/test/fixedbugs/issue11610.go
index cb5ced6d7c..5e77932362 100644
--- a/test/fixedbugs/issue11610.go
+++ b/test/fixedbugs/issue11610.go
@@ -1,4 +1,4 @@
-// errorcheck -newparser=0
+// errorcheck
 
 // Copyright 2015 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
@@ -7,15 +7,11 @@
 // Test an internal compiler error on ? symbol in declaration
 // following an empty import.
 
-// TODO(mdempsky): Update for new parser. New parser recovers more
-// gracefully and doesn't trigger the "cannot declare name" error.
-// Also remove "errorcheck -newparser=0" case in go/types.TestStdFixed.
-
 package a
 import""  // ERROR "import path is empty"
 var?      // ERROR "illegal character U\+003F '\?'"
 
-var x int // ERROR "unexpected var" "cannot declare name"
+var x int // ERROR "unexpected var"
 
 func main() {
 }
diff --git a/test/nul1.go b/test/nul1.go
index 624101b621..fbba19857b 100644
--- a/test/nul1.go
+++ b/test/nul1.go
@@ -1,4 +1,4 @@
-// errorcheckoutput -newparser=0
+// errorcheckoutput
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
@@ -6,10 +6,6 @@
 
 // Test source files and strings containing NUL and invalid UTF-8.
 
-// TODO(mdempsky): Update error expectations for -newparser=1. The new
-// lexer skips over NUL and invalid UTF-8 sequences, so they don't emit
-// "illegal character" or "invalid identifier character" errors.
-
 package main
 
 import (
@@ -40,7 +36,7 @@ var y = ` + "`in raw string \x00 foo`" + `  // ERROR "NUL"
 
 /* in other comment ` + "\x00" + ` */ // ERROR "NUL"
 
-/* in source code */ ` + "\x00" + `// ERROR "NUL" "illegal character"
+/* in source code */ ` + "\x00" + `// ERROR "NUL"
 
 var xx = "in string ` + "\xc2\xff" + `" // ERROR "UTF-8"
 
@@ -51,9 +47,9 @@ var yy = ` + "`in raw string \xff foo`" + `  // ERROR "UTF-8"
 /* in other comment ` + "\xe0\x00\x00" + ` */ // ERROR "UTF-8|NUL"
 
 /* in variable name */
-var z` + "\xc1\x81" + ` int // ERROR "UTF-8" "invalid identifier character"
+var z` + "\xc1\x81" + ` int // ERROR "UTF-8"
 
-/* in source code */ ` + "var \xc2A int" + `// ERROR "UTF-8" "invalid identifier character"
+/* in source code */ ` + "var \xc2A int" + `// ERROR "UTF-8"
 
 `)
 }
diff --git a/test/syntax/chan1.go b/test/syntax/chan1.go
index 22724fd297..a33a0d4cea 100644
--- a/test/syntax/chan1.go
+++ b/test/syntax/chan1.go
@@ -1,21 +1,17 @@
-// errorcheck -newparser=0
+// errorcheck
 
 // Copyright 2010 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// TODO(mdempsky): Update for new parser or delete.
-// Like go/parser, the new parser doesn't specially recognize
-// send statements misused in an expression context.
-
 package main
 
 var c chan int
 var v int
 
 func main() {
-	if c <- v { // ERROR "used as value"
+	if c <- v { // ERROR "used as value|missing condition|invalid condition"
 	}
 }
 
-var _ = c <- v // ERROR "used as value"
+var _ = c <- v // ERROR "used as value|unexpected <-"
diff --git a/test/syntax/semi4.go b/test/syntax/semi4.go
index 262926a01e..6f5592ef0e 100644
--- a/test/syntax/semi4.go
+++ b/test/syntax/semi4.go
@@ -1,4 +1,4 @@
-// errorcheck -newparser=0
+// errorcheck
 
 // Copyright 2010 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
@@ -14,4 +14,4 @@ package main
 func main() {
 	for x		// GCCGO_ERROR "undefined"
 	{		// ERROR "missing .*{.* after for clause|missing operand"
-		z	// GCCGO_ERROR "undefined"
+		z	// ERROR "undefined|missing { after for clause"