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Why are underscores only allowed in type patterns? #2

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robsimmons opened this issue Apr 12, 2012 · 0 comments

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robsimmons commented Apr 12, 2012

As near as I can tell, this is allowed:

a: type.
t2: PI [!_,!_] : (!a * !a) . a = \[!x,!y]. x.

but this is not, and gives a parse error:

t3: PI [!_,!_] : (!a * !a) . a = \[!x,!_]. x.

This is a bit inconsistent and makes it more difficult than it needs to be to explain patterns.

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