library;
//
// Problems in library:
//
// pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart:21:12: Error: A value of type 'List<T>' can't be assigned to a variable of type 'List<B>'.
//  - 'List' is from 'dart:core'.
//  - 'B' is from 'pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart'.
//       xs = ys;
//            ^
//
// pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart:33:13: Error: A value of type 'List<List<T>>' can't be assigned to a variable of type 'List<List<B>>'.
//  - 'List' is from 'dart:core'.
//  - 'B' is from 'pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart'.
//       xss = yss;
//             ^
//
import self as self;
import "dart:core" as core;

class A extends core::Object {
  synthetic constructor •() → self::A*
    : super core::Object::•()
    ;
  abstract member-signature get _identityHashCode() → core::int*;
  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*;
  abstract member-signature operator ==(dynamic other) → core::bool*;
  abstract member-signature get hashCode() → core::int*;
  abstract member-signature method toString() → core::String*;
  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic;
  abstract member-signature get runtimeType() → core::Type*;
}
class B extends self::A {
  synthetic constructor •() → self::B*
    : super self::A::•()
    ;
}
class Class<T extends self::A* = self::A*> extends core::Object {
  synthetic constructor •() → self::Class<self::Class::T*>*
    : super core::Object::•()
    ;
  method method1a(generic-covariant-impl self::Class::T* t) → void {
    if(t is self::B*) {
      core::List<self::Class::T*>* ys = <self::Class::T*>[t{self::Class::T* & self::B* /* '*' & '*' = '*' */}];
      self::xs = let final<BottomType> #t1 = invalid-expression "pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart:21:12: Error: A value of type 'List<T>' can't be assigned to a variable of type 'List<B>'.
 - 'List' is from 'dart:core'.
 - 'B' is from 'pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart'.
      xs = ys;
           ^" in ys as{TypeError} core::List<self::B*>*;
    }
  }
  method method1b(generic-covariant-impl self::Class::T* t) → void {
    if(t is self::B*) {
      core::List<core::List<self::Class::T*>*>* yss = <core::List<self::Class::T*>*>[<self::Class::T*>[t{self::Class::T* & self::B* /* '*' & '*' = '*' */}]];
      self::xss = let final<BottomType> #t2 = invalid-expression "pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart:33:13: Error: A value of type 'List<List<T>>' can't be assigned to a variable of type 'List<List<B>>'.
 - 'List' is from 'dart:core'.
 - 'B' is from 'pkg/front_end/testcases/general_nnbd_opt_out/issue39344.dart'.
      xss = yss;
            ^" in yss as{TypeError} core::List<core::List<self::B*>*>*;
    }
  }
  method method2a(generic-covariant-impl self::Class::T* t) → void {
    dynamic alias;
    if(t is self::B*) {
      core::List<self::Class::T*>* ys = <self::Class::T*>[t{self::Class::T* & self::B* /* '*' & '*' = '*' */}];
      alias = ys;
      self::xs = alias as{TypeError,ForDynamic} core::List<self::B*>*;
    }
  }
  method method2b(generic-covariant-impl self::Class::T* t) → void {
    dynamic alias;
    if(t is self::B*) {
      core::List<core::List<self::Class::T*>*>* yss = <core::List<self::Class::T*>*>[<self::Class::T*>[t{self::Class::T* & self::B* /* '*' & '*' = '*' */}]];
      alias = yss;
      self::xss = alias as{TypeError,ForDynamic} core::List<core::List<self::B*>*>*;
    }
  }
  abstract member-signature get _identityHashCode() → core::int*;
  abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*;
  abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*;
  abstract member-signature operator ==(dynamic other) → core::bool*;
  abstract member-signature get hashCode() → core::int*;
  abstract member-signature method toString() → core::String*;
  abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic;
  abstract member-signature get runtimeType() → core::Type*;
}
static field core::List<self::B*>* xs;
static field core::List<core::List<self::B*>*>* xss;
static method main() → void {
  self::throws(() → core::Null? {
    new self::Class::•<self::A*>().{self::Class::method2a}(new self::B::•());
    core::print(self::xs.{core::Object::runtimeType});
  });
  self::throws(() → core::Null? {
    new self::Class::•<self::A*>().{self::Class::method2b}(new self::B::•());
    core::print(self::xs.{core::Object::runtimeType});
  });
}
static method errors() → void {
  new self::Class::•<self::A*>().{self::Class::method1a}(new self::B::•());
  new self::Class::•<self::A*>().{self::Class::method1b}(new self::B::•());
}
static method throws(() →* void f) → void {
  try {
    f.call();
  }
  on dynamic catch(final dynamic e) {
    core::print(e);
    return;
  }
  throw "Expected throws";
}