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-rw-r--r--compiler/commands.nim3
1 files changed, 1 insertions, 2 deletions
diff --git a/compiler/commands.nim b/compiler/commands.nim
index 2a2e0c4ee..596cdafba 100644
--- a/compiler/commands.nim
+++ b/compiler/commands.nim
@@ -308,8 +308,7 @@ proc processSwitch(switch, arg: string, pass: TCmdLinePass, info: TLineInfo) =
     expectArg(switch, arg, pass, info)
     options.docSeeSrcUrl = arg
   of "mainmodule", "m":
-    expectArg(switch, arg, pass, info)
-    optMainModule = arg
+    discard "allow for backwards compatibility, but don't do anything"
   of "define", "d": 
     expectArg(switch, arg, pass, info)
     defineSymbol(arg)