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what is 11.19.20-kotlin-1.4.20-bug fr?

skevy/11.19.20-kotlin-1.4.20-bug — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2020-11-19

★ 2KotlinAudience · developerComplexity · 1/5DormantSetup · easy

tl;dr

A minimal reproduction repo documenting a type-inference bug in Kotlin 1.4.20, created to help the Kotlin team diagnose and fix the compiler issue.

vibe map

mindmap
  root((repo))
    What it does
      Reproduces a bug
      Isolates the problem
    Tech stack
      Kotlin
    Use cases
      Report compiler bug
      Check known issues
      Find a workaround
    Audience
      Kotlin maintainers
      Kotlin developers
    Bug details
      Type inference
      Kotlin 1.4.20
    Fix
      Upgrade Kotlin
      Restructure code

Code map

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filefunction / class

what do people make with this?

VIBE 1

Check whether a confusing Kotlin 1.4.20 compile error matches this known type-inference bug.

VIBE 2

Reference this minimal example when reporting or discussing the bug with the Kotlin team.

VIBE 3

Find a workaround by seeing exactly what code pattern triggers the incorrect type inference.

what's the stack?

Kotlin

how it stacks up fr

skevy/11.19.20-kotlin-1.4.20-bugyingwang/filmicad-chd/decloud
Stars223
LanguageKotlinKotlinKotlin
Last pushed2020-11-192026-04-26—
MaintenanceDormantMaintained—
Setup difficultyeasymoderateeasy
Complexity1/53/53/5
Audiencedevelopergeneralgeneral

Figures from each repo's GitHub metadata at analysis time.

how do i run it?

Difficulty · easy time til it works · 5min

Not a library, a minimal bug reproduction case for the Kotlin compiler.

prompts (copy fr)

prompt 1
Explain what type-inference bug this Kotlin 1.4.20 reproduction is demonstrating.
prompt 2
Help me rewrite this code to avoid triggering the Kotlin 1.4.20 type-inference bug.
prompt 3
Show me whether this bug still exists in newer versions of Kotlin.
prompt 4
Walk me through how Kotlin's type inference is supposed to work versus what goes wrong here.

Frequently asked questions

what is 11.19.20-kotlin-1.4.20-bug fr?

A minimal reproduction repo documenting a type-inference bug in Kotlin 1.4.20, created to help the Kotlin team diagnose and fix the compiler issue.

What language is 11.19.20-kotlin-1.4.20-bug written in?

Mainly Kotlin. The stack also includes Kotlin.

Is 11.19.20-kotlin-1.4.20-bug actively maintained?

Dormant — no commits in 2+ years (last push 2020-11-19).

How hard is 11.19.20-kotlin-1.4.20-bug to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is 11.19.20-kotlin-1.4.20-bug for?

Mainly developer.

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