diff --git a/std_shims/macros_shim.nim b/std_shims/macros_shim.nim
index 6d3cee8..636bbb2 100644
--- a/std_shims/macros_shim.nim
+++ b/std_shims/macros_shim.nim
@@ -226,3 +226,11 @@ proc newLitFixed*(arg: tuple): NimNode {.compileTime.} =
   for a,b in arg.fieldPairs:
     result.add nnkExprColonExpr.newTree(newIdentNode(a), newLitFixed(b))
 
+iterator typedParams*(n: NimNode, skip = 0): (NimNode, NimNode) =
+  for i in (1 + skip) ..< n.params.len:
+    let paramNodes = n.params[i]
+    let paramType = paramNodes[^2]
+
+    for j in 0 ..< paramNodes.len - 2:
+      yield (paramNodes[j], paramType)
+
diff --git a/std_shims/strings.nim b/std_shims/strings.nim
new file mode 100644
index 0000000..4dca78d
--- /dev/null
+++ b/std_shims/strings.nim
@@ -0,0 +1,6 @@
+proc add*(s: var string, data: openarray[char]) =
+  if data.len > 0:
+    let prevEnd = s.len
+    s.setLen(prevEnd + data.len)
+    copyMem(addr s[prevEnd], unsafeAddr data[0], data.len)
+