fixes #1902

tests/fields/tfields_in_template.nim

@@ -0,0 +1,15 @@
+discard """
+  output: '''n
+n'''
+"""
+
+# bug #1902
+# This works.
+for name, value in (n: "v").fieldPairs:
+  echo name
+
+# This doesn't compile - "expression 'name' has no type (or is ambiguous)".
+template wrapper: stmt =
+  for name, value in (n: "v").fieldPairs:
+    echo name
+wrapper()