@@ -207,7 +207,7 @@ class AstBuilder extends StackListener {
 
     SimpleIdentifier name;
     if (nameToken != null) {
-      name = ast.simpleIdentifier(nameToken);
+      name = ast.simpleIdentifier(nameToken, isDeclaration: true);
     }
 
     extensionDeclaration = ast.extensionDeclaration(
Original file line number	Diff line number	Diff line change
`@@ -207,7 +207,7 @@ class AstBuilder extends StackListener {`
`207`	`207`
`208`	`208`	`SimpleIdentifier name;`
`209`	`209`	`if (nameToken != null) {`
`210`		`- name = ast.simpleIdentifier(nameToken);`
	`210`	`+ name = ast.simpleIdentifier(nameToken, isDeclaration: true);`
`211`	`211`	`}`
`212`	`212`
`213`	`213`	`extensionDeclaration = ast.extensionDeclaration(`