The previous fix only extracted package path from private methods,
causing segfaults for interfaces with only exported methods (like fs.DirEntry).
Root cause:
- For interfaces with only exported methods, the loop never entered
the !token.IsExported(mName) block
- pkgPath remained empty and fell back to pkg.Path() (compilation package)
- This caused wrong PkgPath for standard library interfaces like fs.DirEntry
- Runtime received wrong package path, leading to segfaults
Fix:
- Extract pkgPath from the FIRST method (any method), not just private ones
- All methods have correct package information via m.Pkg()
- Only fall back to pkg.Path() if the interface has no methods or m.Pkg() is nil
This fixes the readdir demo segfault while maintaining the fix for issue #1370.
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Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>
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