Indentation increases after every format

[tritoke]

macro_rules! impl_sponge_constructor {
    ($func_name:ident, $xof:ident, $sponge:ident, $example_hash:literal) => {
        #[doc=concat!(
            "Construct a ", stringify!($sponge), " directly from `data`\n",
            "\n",
            "Example:\n",
            "\n",
            ".. code-block:: python\n",
            "\n",
            "   >>> from xoflib import shake128\n",
            "   >>> xof = shake128(b\"bytes to absorb\")\n",
            "   >>> xof.read(16).hex()\n",
            "   '250ef380a0f0c92e9506af9893f640fa'\n",
        )]
        #[pyfunction]
        fn $func_name(data: &Bound<'_, PyAny>) -> PyResult<$sponge> {
            Ok($xof::new(Some(data))?.finalize())
        }
    };
}

Whenever I try to format this code rustfmt indents the strings further and further, after three formats it becomes:

macro_rules! impl_sponge_constructor {
    ($func_name:ident, $xof:ident, $sponge:ident, $example_hash:literal) => {
        #[doc=concat!(
                                    "Construct a ", stringify!($sponge), " directly from `data`\n",
                                    "\n",
                                    "Example:\n",
                                    "\n",
                                    ".. code-block:: python\n",
                                    "\n",
                                    "   >>> from xoflib import shake128\n",
                                    "   >>> xof = shake128(b\"bytes to absorb\")\n",
                                    "   >>> xof.read(16).hex()\n",
                                    "   '250ef380a0f0c92e9506af9893f640fa'\n",
                                )]
        #[pyfunction]
        fn $func_name(data: &Bound<'_, PyAny>) -> PyResult<$sponge> {
            Ok($xof::new(Some(data))?.finalize())
        }
    };
}

Rustfmt version:
rustfmt 1.7.0-stable (0514789 2024-07-21)
installed via rustup
OS: Arch Linux

[tritoke]

@kinnison has confirmed that he can reproduce it

[kinnison]

@kinnison has confirmed that he can reproduce it

For reference, I had rustfmt 1.7.0-stable (9b00956 2024-04-29) on the system I tried on.

[tritoke]

Also of note cargo fmt --check claims the code is formatted, but cargo fmt still reformats the code.

[RobinJadoul]

Can also reproduce on the rust playground (tools -> rustfmt, both stable and nightly)

[calebcartwright]

believe it's a duplicate of #5974

[tritoke]

Yeah that looks identical, I'll close this.