Allow must_use if a reason is specified ([must_use = "reason"]) #1109
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Fixes #1108
Adds a
has_attr_namevaluethat checkssyn::Meta::NameValuefor the attribute (original only checkssyn::Meta::Path).must_use now checks for either the
has_attr_wordor the newhas_attr_namevalue.I could not get the depfile.rs tests running locally (for both master and my own fork) so I am unsure if they pass.