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-rw-r--r--lib/system/inclrtl.nim4
-rw-r--r--lib/system/io.nim2
2 files changed, 5 insertions, 1 deletions
diff --git a/lib/system/inclrtl.nim b/lib/system/inclrtl.nim
index 4193f2bdd..6bff819e6 100644
--- a/lib/system/inclrtl.nim
+++ b/lib/system/inclrtl.nim
@@ -48,3 +48,7 @@ when defined(nimlocks):
   {.pragma: benign, gcsafe, locks: 0.}
 else:
   {.pragma: benign, gcsafe.}
+
+template since(version, body: untyped) {.dirty.} =
+  when version <= (NimMajor, NimMinor):
+    body
diff --git a/lib/system/io.nim b/lib/system/io.nim
index fcdfa79c0..7010a7fdb 100644
--- a/lib/system/io.nim
+++ b/lib/system/io.nim
@@ -685,7 +685,7 @@ proc writeFile*(filename, content: string) {.tags: [WriteIOEffect], benign.} =
   else:
     sysFatal(IOError, "cannot open: " & filename)
 
-proc writeFile*(filename: string, content: openArray[byte]) =
+proc writeFile*(filename: string, content: openArray[byte]) {.since: (1, 1).} =
   ## Opens a file named `filename` for writing. Then writes the
   ## `content` completely to the file and closes the file afterwards.
   ## Raises an IO exception in case of an error.