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-rw-r--r--src/Language/GraphQL/AST/Encoder.hs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/Language/GraphQL/AST/Encoder.hs b/src/Language/GraphQL/AST/Encoder.hs
index a1076e4..603023b 100644
--- a/src/Language/GraphQL/AST/Encoder.hs
+++ b/src/Language/GraphQL/AST/Encoder.hs
@@ -226,10 +226,11 @@ typeDefinition formatter = \case
<> optempty (directives formatter) directives'
<> eitherFormat formatter " " ""
<> bracesList formatter (fieldDefinition nextFormatter) fields'
- Full.InterfaceTypeDefinition description' name' directives' fields'
+ Full.InterfaceTypeDefinition description' name' ifaces' directives' fields'
-> optempty (description formatter) description'
<> "interface "
<> Lazy.Text.fromStrict name'
+ <> optempty (" " <>) (implementsInterfaces ifaces')
<> optempty (directives formatter) directives'
<> eitherFormat formatter " " ""
<> bracesList formatter (fieldDefinition nextFormatter) fields'