Returns the length of a character string, ignoring any trailing blanks. This is identical to the standard LEN_TRIM intrinsic, and is only included for backwards compatibility.
GNU extension
Elemental function
RESULT = LNBLNK(STRING)
| STRING | Shall be a scalar of type CHARACTER, with INTENT(IN)
|
The return value is of INTEGER(kind=4) type.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gfortran/LNBLNK.html