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2 points by almkglor 6108 days ago | link | parent

My bet is, this is a thinko by pg. He planned to restrict arform to not emitting anything, but forgot to actually put the restriction.

The code for both forms are quite a few lines apart too.

http://www.paulgraham.com/gh.html section: recognition

Edit: after some time scanning through the code - it seems that arformh's time is measured, but arform's time is not. Or vice versa, I could've gotten confused.

Cref: rfnurl* and rfnurl2* . rfnurl* is "r", r is (defopr r ...), defopr is (... (defop-raw ...)), defop-raw is (... (save-optime ...))

rfunurl2* is "y", y is (defopr-raw y ...), defopr-raw doesn't add any code to the body: (fn ,parms ,@body)