fixes #9610

compiler/semmagic.nim

@@ -329,23 +329,19 @@ proc magicsAfterOverloadResolution(c: PContext, n: PNode,
   of mTypeOf:
     result = semTypeOf(c, n)
   of mSizeOf:
-      # TODO there is no proper way to find out if a type cannot be queried for the size.
-      let size = getSize(c.config, n[1].typ)
-      # We just assume here that the type might come from the c backend
-      if size == szUnknownSize:
-        # Forward to the c code generation to emit a `sizeof` in the C code.
-        result = n
-      elif size >= 0:
-        result = newIntNode(nkIntLit, size)
-        result.info = n.info
-        result.typ = n.typ
-      else:
-
-        localError(c.config, n.info, "cannot evaluate 'sizeof' because its type is not defined completely")
-
-        result = nil
-
-
+    # TODO there is no proper way to find out if a type cannot be queried for the size.
+    let size = getSize(c.config, n[1].typ)
+    # We just assume here that the type might come from the c backend
+    if size == szUnknownSize:
+      # Forward to the c code generation to emit a `sizeof` in the C code.
+      result = n
+    elif size >= 0:
+      result = newIntNode(nkIntLit, size)
+      result.info = n.info
+      result.typ = n.typ
+    else:
+      localError(c.config, n.info, "cannot evaluate 'sizeof' because its type is not defined completely")
+      result = n
   of mAlignOf:
     result = newIntNode(nkIntLit, getAlign(c.config, n[1].typ))
     result.info = n.info