インテル® Fortran コンパイラー XE 13.1 ユーザー・リファレンス・ガイド
Transformational Intrinsic Function (Generic): Returns the argument with trailing blanks removed.
The result is of type character with the same kind parameter as string. Its length is the length of string minus the number of trailing blanks in string.
The value of the result is the same as string, except any trailing blanks are removed. If string contains only blank characters, the result has zero length.