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problem with underspecified seq types in proc definitions of the same name #24449

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Graveflo opened this issue Nov 18, 2024 · 1 comment · May be fixed by #24462
Open

problem with underspecified seq types in proc definitions of the same name #24449

Graveflo opened this issue Nov 18, 2024 · 1 comment · May be fixed by #24462

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@Graveflo
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Graveflo commented Nov 18, 2024 •
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Description

This seems to cause a crash:

proc p(x: var seq)= discard
proc p(x: seq)= discard
var s : seq[int]
p(s)

Nim Version

Nim Compiler Version 2.2.1 [Linux: amd64]
Compiled at 2024-11-18
Copyright (c) 2006-2024 by Andreas Rumpf

git hash: cc696f1
active boot switches: -d:release

Current Output

Nim/compiler/nim.nim(169) nim
Nim/compiler/nim.nim(124) handleCmdLine
Nim/compiler/main.nim(307) mainCommand
Nim/compiler/main.nim(274) compileToBackend
Nim/compiler/main.nim(137) commandCompileToC
Nim/compiler/pipelines.nim(311) compilePipelineProject
Nim/compiler/pipelines.nim(231) compilePipelineModule
Nim/compiler/pipelines.nim(177) processPipelineModule
Nim/compiler/sem.nim(837) semWithPContext
Nim/compiler/sem.nim(799) semStmtAndGenerateGenerics
Nim/compiler/semstmts.nim(2900) semStmt
Nim/compiler/semexprs.nim(1287) semExprNoType
Nim/compiler/semexprs.nim(3526) semExpr
Nim/lib/system.nim(936) semStmtList
Nim/compiler/semexprs.nim(3429) semExpr
Nim/compiler/semexprs.nim(1268) semDirectOp
Nim/compiler/semexprs.nim(1072) semOverloadedCallAnalyseEffects
Nim/compiler/semcall.nim(901) semOverloadedCall
Nim/compiler/semcall.nim(580) resolveOverloads
Nim/compiler/semcall.nim(170) pickBestCandidate
Nim/compiler/sigmatch.nim(425) cmpCandidates
Nim/compiler/sigmatch.nim(299) checkGeneric
Nim/compiler/sigmatch.nim(1883) typeRel
Nim/compiler/types.nim(1697) isEmptyContainer
Nim/compiler/ast.nim(1327) elementType
Nim/lib/system/indices.nim(30) []
Nim/lib/system/fatal.nim(53) sysFatal
Error: unhandled exception: index out of bounds, the container is empty [IndexDefect]

Expected Output

No response

Known Workarounds

No response

Additional Information

This type seems to be created. Not sure how or why

{
  "kind": "tySequence",
  "id": 553648133,
  "sons": []
}
@Graveflo
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!nim c

proc p(x: var seq)= discard
proc p(x: seq)= discard
var s : seq[int]
p(s)

metagn added a commit to metagn/Nim that referenced this issue Nov 21, 2024
@metagn
fix crash with tyBuiltInTypeClass matching itself
2a1f799 
fixes nim-lang#24449
@metagn metagn linked a pull request Nov 21, 2024 that will close this issue
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fix crash with tyBuiltInTypeClass matching itself metagn/Nim
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@Graveflo