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Well, why fix it for eval but not for exec? I don't think
the time hit is noticeable, I ran 'time make test' twice
each on the trunk with and without the patch. Here are the
results:

Trunk:
real    9m17.117s
user    3m30.930s
sys     0m35.417s

real    9m9.471s
user    3m31.484s
sys     0m34.978s

Patch:
real    9m32.469s
user    3m40.134s
sys     0m36.140s

real    9m6.779s
user    3m27.529s
sys     0m34.716s