undefined types

[Fergus Henderson]

Hi Tyson,

Your changes to type_info handling for grades fast & jump
has broken tests/valid/headvar_not_found in those grades.
The reason it breaks is that the test case declares a couple
of types but doesn't define them.  Currently we allow this
in other grades, and so we should allow it in grade fast/jump too.

Can you please fix this one?

-- 
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WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
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