unikernel/duniverse/ppxlib/test/location/attributes/dune

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+(executable
+ (name pp)
+ (libraries ppxlib))
+
+(cram
+ (applies_to print_attr_loc)
+ (deps pp.exe))

unikernel/duniverse/ppxlib/test/location/attributes/pp.ml

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+open Ppxlib
+
+let pp_attr str =
+  let iter =
+    object
+      inherit Ast_traverse.iter as super
+
+      method! attribute v =
+        let loc = loc_of_attribute v in
+        Format.printf "%a %s" Location.print loc v.attr_name.txt;
+        super#attribute v
+    end
+  in
+  iter#structure str;
+  str
+
+let () = Driver.register_transformation ~impl:pp_attr "print-attributes"
+let () = Ppxlib.Driver.standalone ()

unikernel/duniverse/ppxlib/test/location/attributes/print_attr_loc.t

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+The compiler inserts documentation comments with their location set to
+`Location.none`. The value for `Location.none` has changed in the compiler (at
+4.08.0). We provide a function, `loc_of_attribute` to handle deriving better location
+errors for attributes with a none location.
+
+  $ cat > test.ml << EOF
+  > let v = 1
+  > (** A documentation comment! *)
+  > EOF
+
+We run an identity driver that prints the locations of attributes.
+
+  $ ./pp.exe --impl test.ml -o ignore.ml
+  File "test.ml", line 2, characters 0-31: ocaml.doc
+