This issue was originally filed by [email protected]

What steps will reproduce the problem?
Test 1:
class A implements Dynamic {}

main() {
    new A();
}

Test 2:
interface I extends Dynamic {}

class A implements I {}

main() {
    new A();
}

What is the expected output? What do you see instead?
Expected: compile-time error
Actual: compilation ends without errors.

What version of the product are you using? On what operating system?
dartc r2810, Ubuntu 10.04

Please provide any additional information below.
Section 7.9 of the Language Specification: "It is a compile-time error if the implements clause of a class includes type Dynamic."
Section 8.4: "It is a compile-time error if the extends clause of an interface includes type Dynamic."