(probably) Incorrect example

[DanielRrr]

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In Propositions and sets/Mere Proposition, there is the following example:

\func Unit-isProp : isProp Unit => \lam x y => idp

which is rejected with

[ERROR] Intro.ard:543:48: Expressions are not equal
  Left:  x
  Right: y
  In: idp

I was using a freshly built version of the Arend Idea plugin.

Either the proof is wrong (but it doesn't seem so) or there is a bug in the typechecker.