[C++] My unreviewed patch

[Gabriel Dos Reis]

Nathan Sidwell <nathan@codesourcery.com> writes:

| Gabriel Dos Reis wrote:
| > Nathan Sidwell <nathan@codesourcery.com> writes:
| 
| > | It's a pity we can't actuall print out the mismatching template
| > | parameters.
| > Why can't we?
| > -- Gaby
| It's  a tree_list, and we don't dump those (do we?).

We don't currently dump template argument list, but we could -- it is
no different from the way we currently dump tree_list for function
arguments. 

-- Gaby