Add NoFieldSelectors example to GHC-76037

Author: tbidne

message-index/messages/GHC-76037/example4/after/NoFieldSelectorsExport.hs

@@ -0,0 +1,5 @@
+{-# LANGUAGE NoFieldSelectors #-}
+
+module NoFieldSelectorsExport (T (foo)) where
+
+data T = MkT { foo :: T }

message-index/messages/GHC-76037/example4/before/NoFieldSelectorsExport.hs

@@ -0,0 +1,5 @@
+{-# LANGUAGE NoFieldSelectors #-}
+
+module NoFieldSelectorsExport (T, foo) where
+
+data T = MkT { foo :: T }

message-index/messages/GHC-76037/example4/index.md

@@ -0,0 +1,20 @@
+---
+title: Field selector exported with NoFieldSelectors
+---
+
+## Error Message
+
+```
+NoFieldSelectorsExport.hs:3:35: error: [GHC-76037]
+    Not in scope: ‘foo’
+    Suggested fix:
+      Notice that ‘foo’ is a field selector belonging to the type ‘T’
+      that has been suppressed by NoFieldSelectors.
+  |
+3 | module NoFieldSelectorsExport (T, foo) where
+  |                                   ^^^
+```
+
+## Explanation
+
+The field selector `foo` has been disabled via `NoFieldSelectors`, therefore it cannot be a top-level export. The fix is to export it as part of its type `T` (consequently it can be imported for e.g. record creation or updates).