IndexDefect thrown when destructuring a lent value #23454

Nycto · 2024-03-28T15:59:13Z

Description

The following code throws a compiler error, when it is expected to work:

type
    Letter = enum A

    LetterPairs = object
        values: seq[(Letter, string)]

iterator items(list: var LetterPairs): lent (Letter, string) =
    for item in list.values:
        yield item

var instance = LetterPairs(values: @[ (A, "foo") ])

for (a, _) in instance:
    case a
    of A: discard

Nim Version

Nim Compiler Version 2.0.2 [Linux: amd64]
Compiled at 2023-12-15
Copyright (c) 2006-2023 by Andreas Rumpf

git hash: c4c44d10df8a14204a75c34e499def200589cb7c
active boot switches: -d:release

And also:

> ~/Code/Nim/compiler/nim --version       
Nim Compiler Version 2.1.1 [Linux: amd64]
Compiled at 2024-03-14
Copyright (c) 2006-2024 by Andreas Rumpf

git hash: 7657a637b8500e7ab95c18c8559d66cc2da2d124
active boot switches:

Current Output

The thrown error is:


Hint: used config file '/home/nycto/Code/Nim/config/nim.cfg' [Conf]
Hint: used config file '/home/nycto/Code/Nim/config/config.nims' [Conf]
...................................................................../home/nycto/Code/Nim/compiler/nim.nim(169) nim
/home/nycto/Code/Nim/compiler/nim.nim(124) handleCmdLine
/home/nycto/Code/Nim/compiler/main.nim(338) mainCommand
/home/nycto/Code/Nim/compiler/main.nim(304) compileToBackend
/home/nycto/Code/Nim/compiler/main.nim(142) commandCompileToC
/home/nycto/Code/Nim/compiler/pipelines.nim(325) compilePipelineProject
/home/nycto/Code/Nim/compiler/pipelines.nim(245) compilePipelineModule
/home/nycto/Code/Nim/compiler/pipelines.nim(188) processPipelineModule
/home/nycto/Code/Nim/compiler/pipelines.nim(26) processPipeline
/home/nycto/Code/Nim/compiler/cgen.nim(2123) genTopLevelStmt
/home/nycto/Code/Nim/compiler/transf.nim(1244) transformStmt
/home/nycto/Code/Nim/compiler/transf.nim(1160) processTransf
/home/nycto/Code/Nim/compiler/transf.nim(1139) transform
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1031) transform
/home/nycto/Code/Nim/compiler/transf.nim(804) transformFor
/home/nycto/Code/Nim/compiler/transf.nim(1038) transform
/home/nycto/Code/Nim/compiler/transf.nim(269) transformBlock
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1139) transform
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1139) transform
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1038) transform
/home/nycto/Code/Nim/compiler/transf.nim(269) transformBlock
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1036) transform
/home/nycto/Code/Nim/compiler/transf.nim(293) transformWhile
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1139) transform
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1139) transform
/home/nycto/Code/Nim/compiler/transf.nim(109) transformSons
/home/nycto/Code/Nim/compiler/transf.nim(1105) transform
/home/nycto/Code/Nim/compiler/transf.nim(448) transformYield
/home/nycto/Code/Nim/compiler/lowerings.nim(34) newTupleAccess
/home/nycto/Code/Nim/lib/system/fatal.nim(53) sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]



### Expected Output

```text
I expect this code to compile, or at the very least produce an actionable error message

Possible Solution

No response

Additional Information

No response

The text was updated successfully, but these errors were encountered:

juancarlospaco · 2024-03-28T21:07:58Z

!nim c

type
    Letter = enum A

    LetterPairs = object
        values: seq[(Letter, string)]

iterator items(list: var LetterPairs): lent (Letter, string) =
    for item in list.values:
        yield item

var instance = LetterPairs(values: @[ (A, "foo") ])

for (a, _) in instance:
    case a
    of A: discard

github-actions · 2024-03-28T21:08:43Z

🐧 Linux bisect by @juancarlospaco (collaborator)

devel 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
fatal.nim(53)            sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:28
Finished 2024-03-28T21:08:28
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkTupleConstr.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkTupleConstr.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkTupleConstr.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

stable 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
fatal.nim(53)            sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:28
Finished 2024-03-28T21:08:29
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkTupleConstr.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkTupleConstr.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkTupleConstr.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

2.0.2 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
fatal.nim(53)            sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:29
Finished 2024-03-28T21:08:29
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkTupleConstr.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkTupleConstr.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkTupleConstr.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

1.6.14 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
fatal.nim(54)            sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:33
Finished 2024-03-28T21:08:33
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkTupleConstr.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkTupleConstr.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkTupleConstr.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

1.4.8 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
fatal.nim(49)            sysFatal
Error: unhandled exception: index 1 not in 0 .. 0 [IndexDefect]

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:35
Finished 2024-03-28T21:08:36
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkPar.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkPar.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkPar.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

1.2.18 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
/home/runner/work/Nim/Nim/temp.nim(7, 15) Error: address of 'item' may not escape its stack frame

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:38
Finished 2024-03-28T21:08:39
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkPar.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkPar.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkPar.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

1.0.10 👎 FAIL

Output

Error: Command failed: nim c --run  -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim
/home/runner/work/Nim/Nim/temp.nim(7, 15) Error: address of 'item' may not escape its stack frame

IR

Compiled filesize 0 bytes (0 bytes)

Stats

Started 2024-03-28T21:08:41
Finished 2024-03-28T21:08:41
Duration

AST

nnkStmtList.newTree(
  nnkTypeSection.newTree(
    nnkTypeDef.newTree(
      newIdentNode("Letter"),
      newEmptyNode(),
      nnkEnumTy.newTree(
        newEmptyNode(),
        newIdentNode("A")
      )
    ),
    nnkTypeDef.newTree(
      newIdentNode("LetterPairs"),
      newEmptyNode(),
      nnkObjectTy.newTree(
        newEmptyNode(),
        newEmptyNode(),
        nnkRecList.newTree(
          nnkIdentDefs.newTree(
            newIdentNode("values"),
            nnkBracketExpr.newTree(
              newIdentNode("seq"),
              nnkPar.newTree(
                newIdentNode("Letter"),
                newIdentNode("string")
              )
            ),
            newEmptyNode()
          )
        )
      )
    )
  ),
  nnkIteratorDef.newTree(
    newIdentNode("items"),
    newEmptyNode(),
    newEmptyNode(),
    nnkFormalParams.newTree(
      nnkCommand.newTree(
        newIdentNode("lent"),
        nnkPar.newTree(
          newIdentNode("Letter"),
          newIdentNode("string")
        )
      ),
      nnkIdentDefs.newTree(
        newIdentNode("list"),
        nnkVarTy.newTree(
          newIdentNode("LetterPairs")
        ),
        newEmptyNode()
      )
    ),
    newEmptyNode(),
    newEmptyNode(),
    nnkStmtList.newTree(
      nnkForStmt.newTree(
        newIdentNode("item"),
        nnkDotExpr.newTree(
          newIdentNode("list"),
          newIdentNode("values")
        ),
        nnkStmtList.newTree(
          nnkYieldStmt.newTree(
            newIdentNode("item")
          )
        )
      )
    )
  ),
  nnkVarSection.newTree(
    nnkIdentDefs.newTree(
      newIdentNode("instance"),
      newEmptyNode(),
      nnkObjConstr.newTree(
        newIdentNode("LetterPairs"),
        nnkExprColonExpr.newTree(
          newIdentNode("values"),
          nnkPrefix.newTree(
            newIdentNode("@"),
            nnkBracket.newTree(
              nnkPar.newTree(
                newIdentNode("A"),
                newLit("foo")
              )
            )
          )
        )
      )
    )
  ),
  nnkForStmt.newTree(
    nnkVarTuple.newTree(
      newIdentNode("a"),
      newIdentNode("_"),
      newEmptyNode()
    ),
    newIdentNode("instance"),
    nnkStmtList.newTree(
      nnkCaseStmt.newTree(
        newIdentNode("a"),
        nnkOfBranch.newTree(
          newIdentNode("A"),
          nnkStmtList.newTree(
            nnkDiscardStmt.newTree(
              newEmptyNode()
            )
          )
        )
      )
    )
  )
)

Stats

GCC 11.4.0
Clang 14.0.0
NodeJS 19.1
Created 2024-03-28T21:07:58Z
Comments 1
Commands nim c --run -d:nimDebug -d:nimDebugDlOpen -d:ssl -d:nimDisableCertificateValidation --forceBuild:on --colors:off --verbosity:0 --hints:off --lineTrace:off --nimcache:/home/runner/work/Nim/Nim --out:/home/runner/work/Nim/Nim/temp /home/runner/work/Nim/Nim/temp.nim

🤖 Bug found in 16 minutes bisecting 7 commits at 0 commits per second

ringabout self-assigned this Mar 29, 2024

ringabout added a commit that referenced this issue Mar 29, 2024

fixes #23454; IndexDefect thrown when destructuring a lent value

564bcc6

ringabout linked a pull request Mar 29, 2024 that will close this issue

fixes #23454; IndexDefect thrown when destructuring a lent tuple #23458

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IndexDefect thrown when destructuring a lent value #23454

IndexDefect thrown when destructuring a lent value #23454

Nycto commented Mar 28, 2024

juancarlospaco commented Mar 28, 2024

github-actions bot commented Mar 28, 2024

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IndexDefect thrown when destructuring a lent value #23454

IndexDefect thrown when destructuring a lent value #23454

Comments

Nycto commented Mar 28, 2024

Description

Nim Version

Current Output

Possible Solution

Additional Information

juancarlospaco commented Mar 28, 2024

github-actions bot commented Mar 28, 2024

Output

IR

Stats

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IR

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