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Pattern matching on structs causes TyckerException

See original GitHub issue

Commit: beca413

open data Bool : Set | true | false

struct BoolPair : Set
  | fst : Bool
  | snd : Bool

open data U2 (x : BoolPair) : Set
  | (false, false) => zero
  | (false, true) => one
  | (true, false) => two
  | (true, true) => three

def not2 (x : BoolPair) : BoolPair
  | (false, false) => (true, true)
  | (false, true) => (true, false)
  | (true, false) => (false, true)
  | (true, true) => (false, false)

Both the data and the function definition cause the exception.

I don’t really know the syntax for pattern matching on structs, so I could only guess it’s the same as tuples as in Arend. Replace the parentheses with braces and the issue still occurs.

Judging from the source code, tycking for tuple patterns is not yet completed?

Issue Analytics

State:
Created 2 years ago
Comments:7 (7 by maintainers)

Top GitHub Comments

1reaction

refparocommented, Aug 28, 2021

…you need to pattern match on x.fst, x.snd, etc.

This isn’t possible in data definitions…

0reactions

ice1000commented, Aug 28, 2021

…you need to pattern match on x.fst, x.snd, etc.

This isn’t possible in data definitions…

open data U2Impl (x y : Bool) : Set
  | false, false => zero
  | false, true => one
  | true, false => two
  | true, true => three

def U2 (x : BoolPair) => U2Impl x.fst x.snd