Step 2 of the Big Error Shift. Change the representation of errors in "os" to be cleaner. (But they are not really representative of the power of the new scheme.) Step 3 will be to remove all references to os.NewError. Step 4 will be to delete the second half of lib/os/error.go.
Step 2 of the Big Error Shift.
Change the representation of errors in "os" to be cleaner.
(But they are not really representative of the power of the new scheme.)
Step 3 will be to remove all references to os.NewError.
Step 4 will be to delete the second half of lib/os/error.go.

R=rsc
OCL=27587
CL=27587

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