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Add test case for jsffi type mismatch error (#16726) (#25429)

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Issue #16726 reported an internal compiler error (`semcall.nim(229, 18)
nArg != nil`) when calling `toJs` with invalid arguments. The bug has
been fixed in the current codebase but lacked a regression test.

```nim
import std/jsffi
let a = toJs(3)
let b = a.toJs(int)  # Now produces: Error: type mismatch
                      # Previously: internal error
```

**Changes:**
- Added `tests/js/t16726.nim` to verify proper type mismatch error is
reported instead of internal compiler error

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>internal error: semcall.nim(229, 18) nArg !=
nil</issue_title>
> <issue_description>### Example
> the code below should give a clean CT error, not an internal error
> ```nim
> import std/jsffi
> let a = toJs(3)
> let b = a.toJs(int)
> ```
> 
> ### Current Output
> nim r -b:js main
> compiler/semcall.nim(229, 18) `nArg != nil` 
> 
> ### Expected Output
> proper CT error
> 
> ### Additional Information
> 1.5.1 41965880ce
> </issue_description>
> 
> <agent_instructions>adds a test case for it and verify it by `./koch
temp js -r test.nim` before committing</agent_instructions>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> <comment_new><author>@ringabout</author><body>
> related:
https://github.com/nim-lang/Nim/issues/15607</body></comment_new>
> </comments>
> 


</details>



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- Fixes nim-lang/Nim#16726

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Copilot
2026-01-10 21:18:39 +08:00
committed by GitHub
parent 01eedd916c
commit 83d7d8c634
1 changed files with 9 additions and 0 deletions
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tests/js/t16726.nim Normal file
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discard """
errormsg: "type mismatch"
"""
# issue #16726
# the code below should give a clean CT error, not an internal error
import std/jsffi
let a = toJs(3)
let b = a.toJs(int)