tests: Trim .nim files trailing whitespace

via OSX: find . -name '*.nim' -exec sed -i '' -E 's/[[:space:]]+$//' {} +

tests/typerel/trefs.nim

@@ -3,21 +3,21 @@ discard """
   line: 20
   errormsg: "type mismatch"
 """
-# test for ref types (including refs to procs)
-
-type
-  TProc = proc (a, b: int): int {.stdcall.}
-
-proc foo(c, d: int): int {.stdcall.} =
-  return 0
-
-proc wrongfoo(c, e: int): int {.inline.} =
-  return 0
-
-var p: TProc
-p = foo
-write(stdout, "success!")
-p = wrongfoo  #ERROR_MSG type mismatch
-
+# test for ref types (including refs to procs)
+
+type
+  TProc = proc (a, b: int): int {.stdcall.}
+
+proc foo(c, d: int): int {.stdcall.} =
+  return 0
+
+proc wrongfoo(c, e: int): int {.inline.} =
+  return 0
+
+var p: TProc
+p = foo
+write(stdout, "success!")
+p = wrongfoo  #ERROR_MSG type mismatch
+