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Testing metaquots handling of function arity. In OCaml 5.2, the parsetree
was changed to allow a distinction between a function like [fun x y -> x + y]
and a function like [fun x -> fun y -> x + y].
In most cases, the former is preferred and functions like `Ast_builder.pexp_fun`
and metaquots `[%expr...` build maximum arity functions by inserting calls to
`coalesce_arity`.
$ cat > coalesce.ml << EOF
> let b = [%expr fun x -> fun y -> x + y]
> EOF
Here, when the function is an expression metaquot will coalesce the arguments as each
subexpression is handled separately.
$ ./driver.exe coalesce.ml
let b =
(Ppxlib.Ast_builder.Default.coalesce_arity
{
pexp_desc =
(Pexp_function
([{
pparam_loc = loc;
pparam_desc =
(Pparam_val
(Nolabel, None,
{
ppat_desc = (Ppat_var { txt = "x"; loc });
ppat_loc = loc;
ppat_loc_stack = [];
ppat_attributes = []
}))
}], None,
(Pfunction_body
(Ppxlib.Ast_builder.Default.coalesce_arity
{
pexp_desc =
(Pexp_function
([{
pparam_loc = loc;
pparam_desc =
(Pparam_val
(Nolabel, None,
{
ppat_desc =
(Ppat_var { txt = "y"; loc });
ppat_loc = loc;
ppat_loc_stack = [];
ppat_attributes = []
}))
}], None,
(Pfunction_body
{
pexp_desc =
(Pexp_apply
({
pexp_desc =
(Pexp_ident
{ txt = (Lident "+"); loc });
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
},
[(Nolabel,
{
pexp_desc =
(Pexp_ident
{ txt = (Lident "x"); loc
});
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
});
(Nolabel,
{
pexp_desc =
(Pexp_ident
{ txt = (Lident "y"); loc });
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
})]));
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
})));
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
}))));
pexp_loc = loc;
pexp_loc_stack = [];
pexp_attributes = []
} : Ppxlib_ast.Ast.expression)
In order to be as uniform as possible across different compiler versions, we also
keep the same behaviour with function expressions when used as patterns. Here, we
coalesce the first case into a maximum arity function.
$ cat > pat.ml << EOF
> let f v = match v with
> | [%expr fun x -> fun y -> fun z -> x + y + z] -> ()
> | [%expr fun x y z -> x + y + z] -> ()
> | _ -> ()
> EOF
$ ./driver.exe pat.ml
let f v =
match v with
| ({
pexp_desc = Pexp_function
({ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "x"; loc = _ }; ppat_loc = _;
ppat_loc_stack = _; ppat_attributes = _ })
}::{ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "y"; loc = _ };
ppat_loc = _; ppat_loc_stack = _; ppat_attributes = _ })
}::[],
None, Pfunction_body
{
pexp_desc = Pexp_function
({ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "z"; loc = _ };
ppat_loc = _; ppat_loc_stack = _; ppat_attributes = _ })
}::[],
None, Pfunction_body
{
pexp_desc = Pexp_apply
({ pexp_desc = Pexp_ident { txt = Lident "+"; loc = _ };
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ },
(Nolabel,
{
pexp_desc = Pexp_apply
({
pexp_desc = Pexp_ident
{ txt = Lident "+"; loc = _ };
pexp_loc = _; pexp_loc_stack = _;
pexp_attributes = _ },
(Nolabel,
{
pexp_desc = Pexp_ident
{ txt = Lident "x"; loc = _ };
pexp_loc = _; pexp_loc_stack = _;
pexp_attributes = _ })::(Nolabel,
{
pexp_desc =
Pexp_ident
{ txt = Lident "y";
loc = _ };
pexp_loc = _;
pexp_loc_stack = _;
pexp_attributes = _ })::[]);
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _
})::(Nolabel,
{
pexp_desc = Pexp_ident
{ txt = Lident "z"; loc = _ };
pexp_loc = _; pexp_loc_stack = _;
pexp_attributes = _ })::[]);
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ });
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ });
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ }
: Ppxlib_ast.Ast.expression) -> ()
| ({
pexp_desc = Pexp_function
({ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "x"; loc = _ }; ppat_loc = _;
ppat_loc_stack = _; ppat_attributes = _ })
}::{ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "y"; loc = _ };
ppat_loc = _; ppat_loc_stack = _; ppat_attributes = _ })
}::{ pparam_loc = _;
pparam_desc = Pparam_val
(Nolabel, None,
{ ppat_desc = Ppat_var { txt = "z"; loc = _ };
ppat_loc = _; ppat_loc_stack = _;
ppat_attributes = _ })
}::[],
None, Pfunction_body
{
pexp_desc = Pexp_apply
({ pexp_desc = Pexp_ident { txt = Lident "+"; loc = _ };
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ },
(Nolabel,
{
pexp_desc = Pexp_apply
({ pexp_desc = Pexp_ident { txt = Lident "+"; loc = _ };
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _
},
(Nolabel,
{ pexp_desc = Pexp_ident { txt = Lident "x"; loc = _ };
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _
})::(Nolabel,
{
pexp_desc = Pexp_ident
{ txt = Lident "y"; loc = _ };
pexp_loc = _; pexp_loc_stack = _;
pexp_attributes = _ })::[]);
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ })::
(Nolabel,
{ pexp_desc = Pexp_ident { txt = Lident "z"; loc = _ };
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ })::[]);
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ });
pexp_loc = _; pexp_loc_stack = _; pexp_attributes = _ }
: Ppxlib_ast.Ast.expression) -> ()
| _ -> ()