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      1  1.1  mrg - Detect code paths in non-void functions that don't reach a return statement
      2  1.1  mrg 
      3  1.1  mrg - Improve handling of constants and their initializers.  Constant initializers
      4  1.1  mrg   should never generate any code.  This is trival for scalar constants.  It is
      5  1.1  mrg   also trivial for arrays, matrices, and vectors that are accessed with
      6  1.1  mrg   constant index values.  For others it is more complicated.  Perhaps these
      7  1.1  mrg   cases should be silently converted to uniforms?
      8  1.1  mrg 
      9  1.1  mrg - Track source locations throughout the IR.  There are currently several
     10  1.1  mrg   places where we cannot emit line numbers for errors (and currently emit 0:0)
     11  1.1  mrg   because we've "lost" the line number information.  This is particularly
     12  1.1  mrg   noticeable at link time.
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