I've committed the following patch after a 'make pdf' to verify that the change is formatted correctly. The patch updates the documentation for Fortran's MATMUL intrinsic.
2018-02-23 Steven G. Kargl <ka...@gcc.gnu.org> * intrinsic.texi: Arguments to MATMUL cannot both be rank one. Index: intrinsic.texi =================================================================== --- intrinsic.texi (revision 257951) +++ intrinsic.texi (working copy) @@ -9870,6 +9870,7 @@ one or two. type; otherwise, an array of @code{LOGICAL} type. The rank shall be one or two, and the first (or only) dimension of @var{MATRIX_B} shall be equal to the last (or only) dimension of @var{MATRIX_A}. +@var{MATRIX_A} and @var{MATRIX_B} shall not both be rank one arrays. @end multitable @item @emph{Return value}: -- Steve