diff --git a/cmd/cue/cmd/common.go b/cmd/cue/cmd/common.go
index a67fe94..76ed429 100644
--- a/cmd/cue/cmd/common.go
+++ b/cmd/cue/cmd/common.go
@@ -41,7 +41,7 @@
 // - block comments
 // - old-style field comprehensions
 // - space separator syntax
-const syntaxVersion = -1000 + 100*1 + 2
+const syntaxVersion = -1000 + 100*2 + 1
 
 var defaultConfig = config{
 	loadCfg: &load.Config{
diff --git a/cmd/cue/cmd/script_test.go b/cmd/cue/cmd/script_test.go
index 6e346e8..0c341e1 100644
--- a/cmd/cue/cmd/script_test.go
+++ b/cmd/cue/cmd/script_test.go
@@ -24,7 +24,7 @@
 func TestLatest(t *testing.T) {
 	filepath.Walk("testdata/script", func(fullpath string, info os.FileInfo, err error) error {
 		if !strings.HasSuffix(fullpath, ".txt") ||
-			strings.HasPrefix(filepath.Base(fullpath), "legacy") {
+			strings.HasPrefix(filepath.Base(fullpath), "fix") {
 			return nil
 		}
 
diff --git a/cmd/cue/cmd/testdata/script/legacy.txt b/cmd/cue/cmd/testdata/script/legacy.txt
deleted file mode 100644
index 18d4cab..0000000
--- a/cmd/cue/cmd/testdata/script/legacy.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-cue eval foo.cue
-cmp stderr expect-stderr
-
-cue export foo.cue
-cmp stderr expect-stderr
-
-cue fmt foo.cue
-cmp foo.cue bar.cue
-
--- expect-stderr --
--- foo.cue --
-a: [1]
-b: [ x for x in a ]
-
-X = foo
--- bar.cue --
-a: [1]
-b: [ for x in a { x } ]
-
-let X = foo
\ No newline at end of file
diff --git a/cue/load/config.go b/cue/load/config.go
index cdea276..e08e32f 100644
--- a/cue/load/config.go
+++ b/cue/load/config.go
@@ -474,7 +474,10 @@
 	c.loadFunc = c.loader.loadFunc()
 
 	if c.Context == nil {
-		c.Context = build.NewContext(build.Loader(c.loadFunc))
+		c.Context = build.NewContext(
+			build.Loader(c.loadFunc),
+			build.ParseFile(c.loader.cfg.ParseFile),
+		)
 	}
 
 	return &c, nil
diff --git a/cue/parser/interface.go b/cue/parser/interface.go
index de1cf1f..5ad5459 100644
--- a/cue/parser/interface.go
+++ b/cue/parser/interface.go
@@ -17,8 +17,6 @@
 package parser
 
 import (
-	"fmt"
-
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/ast/astutil"
 	"cuelang.org/go/cue/errors"
@@ -96,7 +94,7 @@
 }
 
 func (e *DeprecationError) Error() string {
-	return fmt.Sprintf("try running `cue fmt` on the file to upgrade.")
+	return "try running `cue fix` on the file or module to upgrade"
 }
 
 // Latest specifies the latest version of the parser, effectively setting
diff --git a/cue/parser/parser.go b/cue/parser/parser.go
index 436a42c..9d96e8f 100644
--- a/cue/parser/parser.go
+++ b/cue/parser/parser.go
@@ -726,7 +726,7 @@
 	if len(list) > 1 {
 		for _, d := range list {
 			if internal.IsBulkField(d) {
-				p.assertV0(p.pos, 1, 3, `only one bulk optional field allowed per struct`)
+				p.assertV0(p.pos, 2, 0, `combining bulk optional fields with other fields`)
 				break
 			}
 		}
@@ -890,6 +890,9 @@
 
 	m.TokenPos = p.pos
 	m.Token = p.tok
+	if p.tok == token.ISA {
+		p.assertV0(p.pos, 2, 0, "use of '::'")
+	}
 	if p.tok != token.COLON && p.tok != token.ISA {
 		p.errorExpected(pos, "':' or '::'")
 	}
@@ -923,6 +926,9 @@
 
 		m.TokenPos = p.pos
 		m.Token = p.tok
+		if p.tok == token.ISA {
+			p.assertV0(p.pos, 2, 0, "use of '::'")
+		}
 		if p.tok != token.COLON && p.tok != token.ISA {
 			if p.tok.IsLiteral() {
 				p.errf(p.pos, "expected ':' or '::'; found %s", p.lit)