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Maybe.gf: add isJust function (synonym for exists)

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john.j.camilleri
2014-01-29 11:17:50 +00:00
parent 3b12abb42e
commit c6703f267f
1 changed files with 1 additions and 0 deletions
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lib/src/prelude/Maybe.gf
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@@ -26,6 +26,7 @@ resource Maybe = open Prelude, Predef in {
-- Functions
exists : (T : Type) -> Maybe T -> Bool = \_,m -> m.exists ;
isJust : (T : Type) -> Maybe T -> Bool = \_,m -> m.exists ;
fromJust : (T : Type) -> Maybe T -> T = \_,m -> case m.exists of {
True => m.inner ;
False => Predef.error "Called fromJust with Nothing"