# 031. Procedures can be recursive topic: {ref}`procedures` Fortran procedures declared `recursive` can call themselves. ```{literalinclude} ../../src/recursive.f90 :language: fortran :caption: recursive.f90 | | ₀ |

``` ```{code-block} text :caption: Output[^gfortran-version] -1 1 1 24 ``` [^gfortran-version]: Compiled using `GNU Fortran (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0` with no flags ````{warning} In GFortran v9 and v10 (and lower versions, presumably), this isn't allowed, and we get: ```text Error: ELEMENTAL attribute conflicts with RECURSIVE attribute ``` ```` ---

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— FortranTip (@fortrantip) December 19, 2021