Compilation error with new ppx_deriving
Hi François,
Installing visitors with ocaml 4.06 and ppx_deriving 4.2.1 lead to a compile error:
# File "VisitorsAnalysis.ml", line 249, characters 57-64:
# Error: This expression has type Parsetree.object_field list
# but an expression was expected of type
# ('a * 'b * Parsetree.core_type) list
# Type Parsetree.object_field is not compatible with type
# 'a * 'b * Parsetree.core_type