Ruby

Suppress warnings by gcc 10.1.0-RC-20200430

• Folding results should not be empty.

  If OnigCodePointCount(to->n) were 0, for loop using fn
  wouldn't execute and ncs elements are not initialized.

  enc/unicode.c:557:21: warning: 'ncs[0]' may be used uninitialized in this function [-Wmaybe-uninitialized] 557 | for (i = 0; i < ncs[0]; i++) { | ~~~^~~ 

• Cast to enum yytokentype

  Additional enums for scanner events by ripper are not included
  in yytokentype.

  ripper.y:7274:28: warning: implicit conversion from 'enum <anonymous>' to 'enum yytokentype' [-Wenum-conversion]