renamed writeln to writeLine in tests

tests/overflw/toverflw.nim

@@ -2,20 +2,20 @@ discard """
   file: "toverflw.nim"
   output: "the computation overflowed"
 """
-# Tests nim's ability to detect overflows
-
-{.push overflowChecks: on.}
-
-var
-  a, b: int
-a = high(int)
-b = -2
-try:
-  writeln(stdout, b - a)
-except OverflowError:
-  writeln(stdout, "the computation overflowed")
-
-{.pop.} # overflow check
-#OUT the computation overflowed
+# Tests nim's ability to detect overflows
+
+{.push overflowChecks: on.}
+
+var
+  a, b: int
+a = high(int)
+b = -2
+try:
+  writeLine(stdout, b - a)
+except OverflowError:
+  writeLine(stdout, "the computation overflowed")
+
+{.pop.} # overflow check
+#OUT the computation overflowed