Another variation of "Error: internal error: expr(skModule); unknown symbol"

[kraptor]

Description

I found another way to trigger a compiler crash with the output:
Error: internal error: expr(skModule); unknown symbol

Example:

when isMainModule:
  import std/sequtils
  sequtils

Nim Version

Nim Compiler Version 2.1.1 [Linux: amd64]
Compiled at 2024-03-13
Copyright (c) 2006-2024 by Andreas Rumpf

git hash: 78c834d
active boot switches: -d:release

Current Output

$ nim r program.nim                                                                                                                
Hint: used config file '/home/kraptor/.choosenim/toolchains/nim-#devel/config/nim.cfg' [Conf]
Hint: used config file '/home/kraptor/.choosenim/toolchains/nim-#devel/config/config.nims' [Conf]
.........................................................................
/home/kraptor/program.nim(3, 3) Error: internal error: expr(skModule); unknown symbol
No stack traceback available
To create a stacktrace, rerun compilation with './koch temp r <file>', see https://nim-lang.github.io/Nim/intern.html#debugging-the-compiler for details

Expected Output

The same error when when isMainModule: is not used (or any other useful error):

Error: expression has no type: 
import
  sequtils

sequtils

Possible Solution

No response

Additional Information

Related bugs:

• Error: internal error: expr(skModule); unknown symbol on "import X; X" #19225
• Compiler internal error on invalid code: expr(skModule); unknown symbol #20275