[m-dev.] for review: use readline in the browser

[Zoltan Somogyi]

> +:- pragma c_code(call_trace_getline(Prompt::in, Line::out),
> +	[will_not_call_mercury],
> +	"
> +		char		*line;
> +		char		*mercury_string;
> +
> +		line = MR_address_of_trace_getline((char *)Prompt);

The change looks good, except I would write the above as

		line = (*MR_address_of_trace_getline)((char *) Prompt);

to make clear what is happening.

Being paranoid, I would also check beforehand whether the function pointer
is NULL.

Zoltan.
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