First use of a variable in a method out param should declare it

[hopscc]

Local variables are created (and type inferred) on first assignment

t = 50 * 365 

Since the situation is similar the same should happen if the first time a variable is referenced it is as an out param in a method call

if d.tryGetValue(key, out result)
    print result

Currently it generates an error

error: For "tryGetValue" arg 2: Cannot find "result".

see  Discussion

[hopscc]

Patch + tests + relnote - some refactoring.

Needed to add a warning wrt overloaded methods (with undefined out variable).

[Chuck]

Thanks. Applied in changeset:2446