library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A<T extends core::num> extends core::Object {
  synthetic constructor •() → self::A<self::A::T>
    : super core::Object::•()
    ;
  method foo() → <S extends self::A::T = dynamic>(S) → void {
    core::print("foo: T = ${self::A::T}");
    return <S extends self::A::T>(S a) → void {};
  }
}
class B<T extends core::num> extends core::Object {
  synthetic constructor •() → self::B<self::B::T>
    : super core::Object::•()
    ;
  method foo() → (self::B::T) → void {
    core::print("foo: T = ${self::B::T}");
    return (self::B::T a) → void {};
  }
}
static field self::A<core::num> a = new self::A::•<core::int>();
static field self::B<core::num> b = new self::B::•<core::int>();
static method main() → dynamic {
  try {
    self::a.{self::A::foo}(){() → <S extends core::num = dynamic>(S) → void} as{TypeError,CovarianceCheck,ForNonNullableByDefault} <S extends core::num = dynamic>(S) → void;
    throw "Expected TypeError";
  }
  on core::TypeError catch(final core::TypeError e) {
    core::print(e);
  }
  try {
    self::b.{self::B::foo}(){() → (core::num) → void} as{TypeError,CovarianceCheck,ForNonNullableByDefault} (core::num) → void;
    throw "Expected TypeError";
  }
  on core::TypeError catch(final core::TypeError e) {
    core::print(e);
  }
}