rename ranges/stackarray to stackarrays for consitency

ranges/stackarrays.nim

@@ -40,9 +40,10 @@ iterator mpairs*(a: var StackArray): (int, var a.T) =
 
 template allocStackArray*(T: typedesc, size: int): auto =
   if size < 0: raise newException(RangeError, "allocation with a negative size")
-  # XXX: is it possible to perform a stack size check before
-  # calling `alloca`? Nim has a stackBottom pointer in the
-  # system module.
+  # XXX: is it possible to perform a stack size check before calling `alloca`?
+  # On thread init, Nim may record the base address and the capacity of the stack,
+  # so in theory we can verify that we still have enough room for the allocation.
+  # Research this.
   var
     bufferSize = size * sizeof(T)
     totalSize = sizeof(int) + bufferSize

tests/tstackarrays.nim

@@ -1,6 +1,6 @@
 import
   unittest, math,
-  ../ranges/stackarray
+  ../ranges/stackarrays
 
 suite "Stack arrays":
   test "Basic operations work as expected":
@@ -8,7 +8,7 @@ suite "Stack arrays":
     check:
       type(arr[0]) is int
       arr.len == 10
-    
+
     # all items should be initially zero
     for i in arr: check i == 0
     for i in 0 .. arr.high: check arr[i] == 0