How to easily identify that a FUNCTION_DECL is a lambda

[Jason Merrill]

On Wed, Jul 18, 2018 at 7:03 PM, Martin Liška <mliska@suse.cz> wrote:
> On 07/18/2018 03:45 AM, Jason Merrill wrote:
>> On Mon, Jul 16, 2018 at 5:23 PM, Martin Liška <mliska@suse.cz> wrote:
>>> For purpose of --coverage I would like to distinguish lambda functions
>>> among DECL_ARTIFICIAL functions.
>>
>> I'm curious, why?
>
> It's important for GCOV to report coverage for functions that are
> really present in a source file. Lambdas are such functions.
> On the other hand functions like _Z41__static_initialization_and_destruction_*
> or some implicit constructors (Centering<3>::Centering(Centering<3> const&))
> should not be reported. It confuses a user. Note that both have a valid
> location and one can't distinguish them.

Those other functions may have *a* location, but only
DECL_SOURCE_LOCATION; could we distinguish on that basis?

Jason