# Loosing Type of ClosureLiteral (The Parameter) **URL:** \ **Category:** MPS\ **Tags:** baselanguage, generator\ **Created:** [December 9, 2025, 4:55pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302 "2025-12-09T16:55:28Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![danielstieger](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/danielstieger/32/2431_2.png) [@danielstieger](https://platform.jetbrains.com/u/danielstieger)\ **Post date:** [December 9, 2025, 4:55pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/1 "2025-12-09T16:55:28Z")
Hi there, when using a ClosureLiteral with a Param in the generator, i loose the type information (probably param and return type). The generation process stops with “cannot calculate type for closure literal”. ![image](https://us1.discourse-cdn.com/flex001/uploads/jetbrains_platform/original/2X/a/abb4f653256785b39367ed4da541528f8bbb04c6.png) I m just wondering if there is a way to circumvent this situation in the generator (hinting the type somehow?). Of course, i could go with the interface.methodcall instead, but that wouldn t generate a nice literal in the generated code…. Any suggestions what i should try? Thanks for any idea, Daniel ---
**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [December 19, 2025, 5:01pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/2 "2025-12-19T17:01:44Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [December 29, 2025, 5:04pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/3 "2025-12-29T17:04:09Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [January 8, 2026, 5:10pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/4 "2026-01-08T17:10:57Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [January 18, 2026, 5:17pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/5 "2026-01-18T17:17:39Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [January 28, 2026, 5:25pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/6 "2026-01-28T17:25:58Z")
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**Author:** ![fisakov](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/fisakov/32/1076_2.png) [@fisakov](https://platform.jetbrains.com/u/fisakov)\ **Post date:** [January 30, 2026, 12:02pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/7 "2026-01-30T12:02:26Z")
Hi Daniel, sorry for being late with a reply. The issue with closure literal’s type not properly inferred at generation time is a tricky one. For optimization’s sake the types are computed “locally”, which may cause some information crucial for a proper type analysis to be lost, if the typesystem rules do not declare dependencies properly. But that is not the only possible cause for a miscalculated type. To better understand your use case, could you provide some more details? If you believe this to be a bug, it’s probably better to just submit an issue in YouTrack. Thanks. ---
**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [February 9, 2026, 12:03pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/8 "2026-02-09T12:03:59Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [February 19, 2026, 12:07pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/9 "2026-02-19T12:07:01Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [March 1, 2026, 8:16pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/10 "2026-03-01T20:16:07Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [March 11, 2026, 8:16pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/11 "2026-03-11T20:16:18Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [March 21, 2026, 8:40pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/12 "2026-03-21T20:40:55Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [March 31, 2026, 8:51pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/13 "2026-03-31T20:51:02Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [April 10, 2026, 8:51pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/14 "2026-04-10T20:51:12Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [April 20, 2026, 9:03pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/15 "2026-04-20T21:03:37Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [April 30, 2026, 9:05pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/16 "2026-04-30T21:05:24Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [May 10, 2026, 9:10pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/17 "2026-05-10T21:10:26Z")
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**Author:** ![system](https://sea1.discourse-cdn.com/flex001/user_avatar/platform.jetbrains.com/system/32/40_2.png) [@system](https://platform.jetbrains.com/u/system)\ **Post date:** [August 8, 2026, 9:11pm UTC](https://platform.jetbrains.com/t/loosing-type-of-closureliteral-the-parameter/3302/18 "2026-08-08T21:11:17Z")
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