[Swift-devel] source location passthrough

[Ben Clifford]

A bunch of error reporting might be made more useful if we pass the source 
file location (line, at least) through the various intermediate languages 
so that errors like this:

$ swift fmri.swift 
Swift V 0.0405
RunID: 8zr1mg5964q90
Execution failed:
        java.lang.IndexOutOfBoundsException: Index: 1, Size: 1

have a bit more context.

Bit of a hassle to implement, though.

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