if (EXPR1) { return A };
if (EXPR2) { return B };
if (EXPR3) { return C };
die "unmatched case";

EXPR1 and return A;
EXPR2 and return B;
EXPR3 and return C;
die "unmatched case";

return A if EXPR1;
return B if EXPR2;
return C if EXPR3;
die "unmatched case";