downto, upto, step to return Enumerator

mrblib/numeric.rb

@@ -45,6 +45,8 @@ module Integral
   #
   # ISO 15.2.8.3.15
   def downto(num, &block)
+    return to_enum(:downto, num) unless block_given?
+
     i = self.to_i
     while(i >= num)
       block.call(i)
@@ -84,6 +86,8 @@ module Integral
   #
   # ISO 15.2.8.3.27
   def upto(num, &block)
+    return to_enum(:upto, num) unless block_given?
+
     i = self.to_i
     while(i <= num)
       block.call(i)
@@ -97,6 +101,8 @@ module Integral
   # incremented by +step+ (default 1).
   #
   def step(num, step=1, &block)
+    return to_enum(:step, num, step) unless block_given?
+
     i = if num.kind_of? Float then self.to_f else self end
     while(i <= num)
       block.call(i)

src/string.c

@@ -754,7 +754,7 @@ mrb_memsearch(const void *x0, mrb_int m, const void *y0, mrb_int n)
   else if (m < 1) {
     return 0;
   }
- else if (m == 1) {
+  else if (m == 1) {
     const unsigned char *ys = y, *ye = ys + n;
     for (; y < ye; ++y) {
       if (*x == *y)