The intent is that the code in stdlib.ispc that is calling out to the built-ins
should match argument types exactly (using explicit casts as needed), just
for maximal clarity/safety.
- Don't suggest matches when given an empty string or a single, non-alpha
character.
- Also fixed the parser to be a bit less confusing when it encounters an
unexpected EOF.
This commit adds support for swizzles like "foo.zy" (if "foo" is,
for example, a float<3> type) as rvalues. (Still need support for
swizzles as lvalues.)
A few more productions to recover from parse errors (in function parameter lists and in statement lists). These eliminate some of the massive cascading error messages from a single parse error that the previous error recovery strategy would sometimes cause. Fixes issue #44.
