Repository: pytest-dev/pytest
File: src/_pytest/_code/code.py (Python)

Code before:
        the beginning).
        """

        def _get_single_subexc(
            eg: BaseExceptionGroup[BaseException],
        ) -> BaseException | None:
            res: BaseException | None = None
            for subexc in eg.exceptions:
                if res is not None:
                    return None

                if isinstance(subexc, BaseExceptionGroup):
                    res = _get_single_subexc(subexc)
                    if res is None:
                        # there were multiple exceptions in the subgroup
                        return None
                else:
                    res = subexc
            return res

        if (
            tryshort
            and isinstance(self.value, BaseExceptionGroup)
            and (subexc := _get_single_subexc(self.value)) is not None
        ):
            return f"[in {type(self.value).__name__}] {subexc!r}"

        lines = format_exception_only(self.type, self.value)
        text = "".join(lines)
        text = text.rstrip()
        if tryshort:
            if text.startswith(self._striptext):
                text = text[len(self._striptext) :]
        return text

    def errisinstance(self, exc: EXCEPTION_OR_MORE) -> bool:
        """Return True if the exception is an instance of exc.

        Consider using ``isinstance(excinfo.value, exc)`` instead.
        """
        return isinstance(self.value, exc)

    def _getreprcrash(self) -> ReprFileLocation | None:
        # Find last non-hidden traceback entry that led to the exception of the
        # traceback, or None if all hidden.
        for i in range(-1, -len(self.traceback) - 1, -1):
            entry = self.traceback[i]
            if not entry.ishidden(self):
                path, lineno = entry.frame.code.raw.co_filename, entry.lineno
                exconly = self.exconly(tryshort=True)
                return ReprFileLocation(path, lineno + 1, exconly)

Review comment (suggestion):
```suggestion
            return f"{subexc!r} [single exception in {type(self.value).__name__}]"
```
as discussed in the issue

Code after:
        the beginning).
        """

        def _get_single_subexc(
            eg: BaseExceptionGroup[BaseException],
        ) -> BaseException | None:
            if len(eg.exceptions) != 1:
                return None
            if isinstance(e := eg.exceptions[0], BaseExceptionGroup):
                return _get_single_subexc(e)
            return e

        if (
            tryshort
            and isinstance(self.value, BaseExceptionGroup)
            and (subexc := _get_single_subexc(self.value)) is not None
        ):
            return f"{subexc!r} [single exception in {type(self.value).__name__}]"

        lines = format_exception_only(self.type, self.value)
        text = "".join(lines)
        text = text.rstrip()
        if tryshort:
            if text.startswith(self._striptext):
                text = text[len(self._striptext) :]
        return text

    def errisinstance(self, exc: EXCEPTION_OR_MORE) -> bool:
        """Return True if the exception is an instance of exc.

        Consider using ``isinstance(excinfo.value, exc)`` instead.
        """
        return isinstance(self.value, exc)

    def _getreprcrash(self) -> ReprFileLocation | None:
        # Find last non-hidden traceback entry that led to the exception of the
        # traceback, or None if all hidden.
        for i in range(-1, -len(self.traceback) - 1, -1):
            entry = self.traceback[i]
            if not entry.ishidden(self):
                path, lineno = entry.frame.code.raw.co_filename, entry.lineno
                exconly = self.exconly(tryshort=True)
                return ReprFileLocation(path, lineno + 1, exconly)
        return None

    def getrepr(
        self,
        showlocals: bool = False,
        style: TracebackStyle = "long",
        abspath: bool = False,
        tbfilter: bool