114 lines
4.5 KiB
Perl
114 lines
4.5 KiB
Perl
Most errors happening during ppxlib rewriting process are ultimately turned into
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error extension nodes.
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Undefined derivers are turned into error nodes
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$ echo "type t = int [@@deriving undefined]" >> undefined_deriver.ml
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$ ./deriver.exe undefined_deriver.ml
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type t = int[@@deriving undefined]
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include
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struct
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let _ = fun (_ : t) -> ()
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[%%ocaml.error
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"Ppxlib.Deriving: 'undefined' is not a supported type deriving generator"]
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end[@@ocaml.doc "@inline"][@@merlin.hide ]
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Error nodes are generated when parsing of payload fails.
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export_string expects only one argument, a string, and output it.
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Anything else will embed an error extension node
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$ echo "let _ = [%export_string \"string\"]" > parsing_payload_extension.ml
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$ echo "let _ = [%export_string \"string\" \"other\"]" >> parsing_payload_extension.ml
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$ echo "let _ = [%export_string identifier]" >> parsing_payload_extension.ml
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$ ./extender.exe parsing_payload_extension.ml
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[%%ocaml.error "constant expected"]
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[%%ocaml.error "constant expected"]
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let _ = "string"
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let _ = [%export_string "string" "other"]
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let _ = [%export_string identifier]
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$ echo "type a = int [@@deriving a_string]" > parsing_payload_deriver.ml
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$ echo "type b = int [@@deriving a_string unexpected_args]" >> parsing_payload_deriver.ml
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$ ./deriver.exe parsing_payload_deriver.ml
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type a = int[@@deriving a_string]
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include struct let _ = fun (_ : a) -> ()
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let _ = "derived_string" end[@@ocaml.doc "@inline"][@@merlin.hide
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]
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type b = int[@@deriving a_string unexpected_args]
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include
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struct
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let _ = fun (_ : b) -> ()
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[%%ocaml.error
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"Ppxlib.Deriving: non-optional labelled argument or record expected"]
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end[@@ocaml.doc "@inline"][@@merlin.hide ]
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Error nodes are generated when dependent derivers are not applied.
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$ echo "type a = int [@@deriving a_dependent_string]" > dependent_derivers.ml
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$ ./deriver.exe dependent_derivers.ml
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type a = int[@@deriving a_dependent_string]
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include
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struct
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let _ = fun (_ : a) -> ()
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[%%ocaml.error
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"Deriver a_string is needed for a_dependent_string, you need to add it before in the list"]
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let _ = "derived_string"
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end[@@ocaml.doc "@inline"][@@merlin.hide ]
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$ echo "type b = int [@@deriving a_dependent_string, a_string]" > dependent_derivers.ml
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$ ./deriver.exe dependent_derivers.ml
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type b = int[@@deriving (a_dependent_string, a_string)]
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include
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struct
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let _ = fun (_ : b) -> ()
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[%%ocaml.error
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"Deriver a_string is needed for a_dependent_string, you need to add it before in the list"]
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let _ = "derived_string"
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let _ = "derived_string"
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end[@@ocaml.doc "@inline"][@@merlin.hide ]
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$ echo "type b = int [@@deriving a_string, a_dependent_string]" > dependent_derivers.ml
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$ ./deriver.exe dependent_derivers.ml
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type b = int[@@deriving (a_string, a_dependent_string)]
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include
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struct
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let _ = fun (_ : b) -> ()
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let _ = "derived_string"
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let _ = "derived_string"
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end[@@ocaml.doc "@inline"][@@merlin.hide ]
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Flag `-raise-embedded-errors` raises the first embedded error in the AST.
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$ echo "let () = ()" > embedded_error.ml
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$ echo "module T = struct [%%ocaml.error \"error 1\"] end" >> embedded_error.ml
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$ echo "[%%ocaml.error \"error 2\"]" >> embedded_error.ml
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$ ./extender.exe embedded_error.ml -raise-embedded-errors
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File "embedded_error.ml", line 2, characters 21-32:
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2 | module T = struct [%%ocaml.error "error 1"] end
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^^^^^^^^^^^
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Error: error 1
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[1]
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Undeprecated `[@@@deriving.end]` runs just fine.
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$ echo "type t [@@deriving_inline a_string] [@@@deriving.end]" > embedded_error.ml
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$ ./deriver.exe embedded_error.ml -diff-cmd "diff -u --label source --label derived"
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type t[@@deriving_inline a_string]
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[@@@deriving.end ]
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--- source
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+++ derived
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@@ -1 +1,4 @@
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-type t [@@deriving_inline a_string] [@@@deriving.end]
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+type t [@@deriving_inline a_string]
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+let _ = fun (_ : t) -> ()
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+let _ = "derived_string"
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+[@@@deriving.end]
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[1]
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Deprecated `[@@@deriving.end]` produces an error.
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$ echo "type t [@@deriving_inline a_string] [@@@deriving.end]" > embedded_error.ml
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$ ./deriver.exe embedded_error.ml -allow-deriving-end false
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[%%ocaml.error
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"ppxlib: [@@@deriving.end] is deprecated, please use [@@@ppxlib.inline.end]. If you need the deprecated attribute temporarily, pass [-allow-deriving-end] to the ppx driver)."]
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type t[@@deriving_inline a_string]
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[@@@deriving.end ]
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