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