Ohm-JS fails to complain about (some) missing semantic actions

[guitarvydas]

// Ohm-JS fails to complain about missing semantic actions - the ones that are commented out.

// If you delete "s2" from the formals of rexpr_general, Ohm-JS complains (correctly) about the arity mismatch.

var ohm = require ('ohm-js')

const grammar = ohm.grammar (
`
C2CL0 {

top = oneCharOrRexpr+

oneCharOrRexpr =
| space -- space
| &"(" rexpr -- rexpr
| any -- other

rexpr =
| pattern spaces -- pattern
| "(" spaces rexpr* ")" spaces -- general
| verbatim spaces -- verbatim
| atom spaces -- bottom

pattern = ~any any any any
verbatim = ~any any any any
atom = ~any any any any
}
`);

const semantics = grammar.createSemantics ().addOperation ("junk", {
top (x) {},
//oneCharOrRexpr_space (x) {},
//oneCharOrRexpr_rexpr (la, x) {},
//oneCharOrRexpr_other (x) {},
//rexpr_pattern (x, s) {},
rexpr_general (lp, s, rs, rp, s2) {},
//rexpr_verbatim (x, s) {},
//rexpr_bottom (x, s) {},
_terminal () {}
});