[Caml-list] Hunting polymorphic function applications

[Caml-list] Hunting polymorphic function applications

[Jon Harrop]

For elegance, I've been using the built-in polymorphic comparisons 
(particularly equality) to compare ASTs. I just added some metadata to my AST 
type and now it needs its own comparison function (or polymorphic compare 
bails at run-time with Invalid_argument "equal: functional value").

Is there an easy way, or does anyone have a tool, which will let me track down 
all applications of polymorphic functions to my AST type so that I can alter 
them to use my customised versions?

Cheers,
Jon.

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Re: [Caml-list] Hunting polymorphic function applications

[Alain Frisch]

On Fri, 23 Jul 2004, Jon Harrop wrote:

> For elegance, I've been using the built-in polymorphic comparisons
> (particularly equality) to compare ASTs. I just added some metadata to my AST
> type and now it needs its own comparison function (or polymorphic compare
> bails at run-time with Invalid_argument "equal: functional value").
>
> Is there an easy way, or does anyone have a tool, which will let me track down
> all applications of polymorphic functions to my AST type so that I can alter
> them to use my customised versions?

I sometimes use the following trick: redefine the operators at the
beginning of the module. E.g.:

let (=) (x:unit) : unit = assert false
let (<=) (x:unit) : unit = assert false
...
let compare (x:unit) : unit = assert false

This should produce type-errors where expected.

(Variant: "let (<=) = ((<=) : int -> int -> bool)" to
restrict the use to the integer case)

-- Alain



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