flang/docs/Directives.md

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# Compiler directives supported by Flang

A list of non-standard directives supported by Flang

* `!dir$ fixed` and `!dir$ free` select Fortran source forms.  Their effect
  persists to the end of the current source file.
* `!dir$ ignore_tkr (tkr) var-list` omits checks on type, kind, and/or rank.