Commits on Jul 8, 2016

1. implement comprehensions as collect of a Generator …

   this removes `static_typeof` and `type_goto`
   
   fixes #7258

   

   JeffBezanson committed Jul 8, 2016
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2. make size of a product iterator concatenate the sizes of its compon… …

   …ents
   
   this removes an extra layer of wrapping with `IteratorND`
   
   add some inline declarations for `Generator` iteration
   
   remove unused `IteratorND` type

   

   JeffBezanson committed Jul 8, 2016
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3. use inferred type for empty comprehensions if it is a leaf type …

   this implements the "Steve Johnson compromise":
   - non-empty comprehensions don't depend on inference at all
   - in the empty case, we use either Union{} or the inferred type
   - therefore there is no regression in type precision in cases where
     we can infer a leaf type
   
   add Core.Inference.return_type
   
   This computes a return type (at compile time if possible) in a way that handles
   recursive dependencies in inference.

   

   JeffBezanson committed Jul 8, 2016
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4. do some eta reduction (use f instead of x->f(x)) in Generator syntax

   

   JeffBezanson committed Jul 8, 2016
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5. take advantage of shape-preserving comprehensions in vectorize macros

   

   JeffBezanson committed Jul 8, 2016
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6. add comprehension filters (fixes #550) and nested loops (fixes #4867) …

   this also uses the new lowering for typed comprehensions, allowing all
   comprehensions on unknown-length iterables (fixes #1457)

   

   JeffBezanson committed Jul 8, 2016
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7. doc/NEWS updates for comprehension changes

   

   JeffBezanson committed Jul 8, 2016
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8. Tests and documentation for generators with guards and nesting.

   

   quinnj authored and JeffBezanson committed Jul 8, 2016
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9. shorten call chain for collect(::Generator)

   

   JeffBezanson committed Jul 8, 2016
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