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commit e3512d887df41a8162c3e361171c04beca08415b
Author: Tom Stejskal <tom.stejskal@gmail.com>
Date: Mon Nov 19 20:09:43 2018 +0100
Fix Map.!: given key is not an element in the map
diff --git a/compiler/src/Elm/Compiler/Type/Extract.hs b/compiler/src/Elm/Compiler/Type/Extract.hs
index 1aafe1d4..99763392 100644
--- a/compiler/src/Elm/Compiler/Type/Extract.hs
+++ b/compiler/src/Elm/Compiler/Type/Extract.hs
@@ -10,6 +10,7 @@ module Elm.Compiler.Type.Extract
import Data.Map ((!))
+import qualified Data.Map as Map
import qualified Data.Maybe as Maybe
import qualified Data.Set as Set
@@ -134,11 +135,15 @@ extractUnion interfaces (Opt.Global home name) =
else
let
pname = toPublicName home name
- unions = I._unions (interfaces ! home)
+ maybeUnions = I._unions <$> Map.lookup home interfaces
in
- case I.toUnionInternals (unions ! name) of
- Can.Union vars ctors _ _ ->
- T.Union pname vars <$> traverse extractCtor ctors
+ case Map.lookup name =<< maybeUnions of
+ Just union ->
+ case I.toUnionInternals union of
+ Can.Union vars ctors _ _ ->
+ T.Union pname vars <$> traverse extractCtor ctors
+ Nothing ->
+ return $ T.Union pname [] []
extractCtor :: Can.Ctor -> Extractor (N.Name, [T.Type])
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