Silent truncation of diet templates when rendering non-string Json node

[luismarques]

Given the vibe.d code:

auto j = parseJsonString(`{"foo": 42}`);
auto foo = j.foo;
res.render!("test.dt", foo);

and a template like:

doctype html
html
    head
        title Bug
    body
        p before
        p= foo
        p after

You will only get the content until "before". Everything after is silently dropped. This can be worked around by using something like:

auto j = parseJsonString(`{"foo": 42}`);
auto foo = j.foo.get!int;
res.render!("test.dt", foo);

I think the diet renderer should be able to work with raw Json nodes (without using get!T or to!T), but in any case it should not truncate the output silently.

[s-ludwig]

The root cause is that the p= foo will issue a cast(string)foo, which in turn calls foo.get!string(). However, the type is int, so an exception is thrown, hence the cut off page (run the application with -v or --vv to see the exception). I think in this case, it will be safe to change the rule of how values are converted to strings in vibe.templ.diet._toString. Instead of trying to cast(), try to use toString() first (currently this is done only if casting isn't possible).