test some main()-invariant logic while I'm at it.
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thought I was saying the location is where the . (or ->) is,
which is what I want, but clang doesn't actually expose that.
So I have go through some hoops to try to figure it out.
We were actually seeing a problem with this when running:
blaze build --host_cpu=k8 --compile_only -k --crosstool_top=//third_party/llvm/crosstool --plugin=//devtools/maintenance/include_what_you_use:run_iwyu //gws/plugins/local/src:enhanced_listing_ad
It has 'msg_->MSG_foo' in it, where MSG_foo is a macro. We
were attributing this use to the file defining MSG_foo, rather
than to us. With this change, we properly attribute it to us.
R=dsturtevant
DELTA=150 (125 added, 6 deleted, 19 changed)
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Kim Grasman