warningAsError is only available on nim >1.6

config.nims

@@ -5,12 +5,12 @@ if dirExists("nimbledeps/pkgs"):
 switch("warning", "CaseTransition:off")
 switch("warning", "ObservableStores:off")
 switch("warning", "LockLevel:off")
-switch("warningAsError", "UseBase:on")
 --define:chronosStrictException
 --styleCheck:usages
 if (NimMajor, NimMinor) < (1, 6):
   --styleCheck:hint
 else:
+  switch("warningAsError", "UseBase:on")
   --styleCheck:error
 
 # Avoid some rare stack corruption while using exceptions with a SEH-enabled