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-rw-r--r--lib/system.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/system.nim b/lib/system.nim
index 12c5c6303..8948c62a1 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -2194,7 +2194,8 @@ elif hostOS != "standalone":
       inc(i)
   {.pop.}
 
-proc echo*(x: varargs[expr, `$`]) {.magic: "Echo", tags: [WriteIOEffect], benign.}
+proc echo*(x: varargs[expr, `$`]) {.magic: "Echo", tags: [WriteIOEffect],
+  benign, sideEffect.}
   ## Writes and flushes the parameters to the standard output.
   ##
   ## Special built-in that takes a variable number of arguments. Each argument