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+# Strict raw types static analysis option
+
+This document specifies the "Strict raw types" mode enabled with a static
+analysis option. As a static analysis option, we only intend to implement this
+feature in the Dart Analyzer. Under this feature, a type with omitted type
+argument(s) is defined as a "raw type." Dart fills in such type arguments with
+their bounds, or `dynamic` if there are no bounds.
+
+## Enabling strict raw types
+
+ To enable strict raw types, set the `strict-raw-types` option to `true`, under
+ the Analyzer's `language` section:
+
+ ```yaml
+analyzer:
+  language:
+    strict-raw-types: true
+```
+
+## Motivation
+
+It is possible to write Dart code that passes all static type analysis and
+compile-time checks that is guaranteed to result in runtime errors. Common
+examples include runtime type errors, and no-such-method errors. Developers are
+often surprised to see such errors at runtime, which look like they should be
+caught at compile time.
+
+The strict raw types mode aims to highlight such code during static analysis.
+We can look at some common examples:
+
+```dart
+void main() {
+  List a = [1, 2, 3];
+}
+```
+
+Developers often think that inference fills in the type of `a` from the right
+side of the assignment. It may look like `a` has the type `List<int>`. But Dart
+fills in omitted type arguments, like `E` on `List`, with `dynamic` (or the
+corresponding type parameter's bound); `List a;` is purely a shorthand for
+`List<dynamic> a;`. Inference then flows from `a` onto the expression on the
+right side of the assignment. This is more obvious in another example:
+
+```dart
+void main() {
+  List a = [1, 2, 3]..forEach((e) => print(e.length));
+  var b = [4, 5, 6]..forEach((e) => print(e.length));
+}
+```
+
+The first statement does not result in any static analysis errors, since the
+type of the list is inferred to be `List<dynamic>`. Instead, the code results
+in a runtime no-such-method error, when the `length` getter is called on an
+`int`.
+
+The second statement, however, allows the type of the list to be inferred from
+its elements, as `List<int>`, which results in a static analysis type error,
+which notes that the getter `length` is not defined on `int`.
+
+Raw types can also lead to unintended dynamic dispatch:
+
+```dart
+void main() {
+  List a = [1, 2, 3];
+  a.forEach((e) => print(e.isEven));
+}
+```
+
+The developer likely does not realize that the parameter `e` of the callback is
+`dynamic`, and that the call to `isEven` is a dynamic dispatch.
+
+Reporting strict raw types encourages developers to fill in omitted type
+arguments, hopefully with something other than `dynamic`. In cases where the
+only good type is `dynamic`, then including it as an explicit type argument
+avoids the raw type, and makes the dynamic behavior more explicit in the code.
+
+## Conditions for a raw type Hint
+
+Any raw type results in a raw type Hint, except under the following conditions:
+
+* the raw type is on the right side of an `as` or an `is` expression
+* the raw type is defined by a class, mixin, or typedef annotated with the
+  `optionalTypeArgs` annotation from the meta package.
+
+## Examples
+
+This section is non-normative. It does not represent an exhaustive selection of
+conditions for a raw type Hint.
+
+```dart
+import 'package:meta/meta.dart';
+
+List l1 = [1, 2, 3];            // Hint
+List<List> l2 = [1, 2, 3];      // Hint
+final f1 = Future.value(7);     // OK
+
+fn1(Map map) => print(map);     // Hint
+Map fn2() => {};                // Hint
+
+class C1 {
+  List l3 = [1, 2, 3];          // Hint
+  print([] is Set);             // OK
+
+  m(Map map) => print(map);     // Hint
+}
+
+class C2<T> {}
+
+class C3 extends C2 {}          // Hint
+class C4 implements C2 {}       // Hint
+class C5 with C2 {}             // Hint
+
+typedef Callback<T> = void Function(T);
+
+Callback = (int n) => print(n); // Hint
+
+@optionalTypeArgs
+class C6<T> {}
+
+C6 a;                           // OK
+List<C6> b;                     // OK
+C6<List> c;                     // Hint
+
+class C7 extends C6 {}          // OK
+```