dart2js: Calling an undefined constructor via new is a warning not an error.

[gbracha]

See issue #1031.

Latest version of spec, section 10.10.1 replaces errors with warnings in cases where the class or the constructor is undeclared. Motivation is similar to other cases: do not impose workflow - just warn and make it a dynamic error.

"Let e be a new expression of the form new T.id(a1, .., an, xn+1: an+1, …, xn+k: an+k) or the form new T(a1, .., an, xn+1: an+1, …, xn+k: an+k). It is a static warning if T is not a class or interface accessible in the current scope, optionally followed by type arguments.

If e is of the form new T.id(a1, .., an, xn+1: an+1, …, xn+k: an+k) it is a static warning if T.id is not the name of a constructor declared by the type T. If e of the form new T(a1, .., an, xn+1: an+1, …, xn+k: an+k) it is a static warning if the type T does not declare a constructor with the same name as the declaration of T.
"

Consequently, it is a dynamic error to call such an undefined constructor:

"Evaluation of e proceeds as follows:

If T is not a class or interface accessible in the current scope, a dynamic error occurs. Otherwise, if q is not defined, a NoSuchMethodError is thrown. Otherwise, if q is a generative constructor (regardless of whether q is redirecting or not), then: ..."

[kasperl]

Set owner to @karlklose.

[karlklose]

Fixed in revision 11220.

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Added Fixed label.