Warn that signal receivers are weakly-referenced
Warn that signal receivers are weakly-referenced

For the signal get_generators in particular, it may seem natural to use
a lambda or inner function as the signal receiver, but this does not
work as the receiver is collected before it can be called.

GiovanniMoretti/pelican,simonjj/pelican,ingwinlu/pelican,getpelican/pelican,levanhien8/pelican,joetboole/pelican,UdeskDeveloper/pelican,joetboole/pelican,11craft/pelican,iurisilvio/pelican,btnpushnmunky/pelican,koobs/pelican,karlcow/pelican,florianjacob/pelican,TC01/pelican,garbas/pelican,kernc/pelican,levanhien8/pelican,lazycoder-ru/pelican,11craft/pelican,kennethlyn/pelican,lucasplus/pelican,farseerfc/pelican,rbarraud/pelican,florianjacob/pelican,Scheirle/pelican,jimperio/pelican,gymglish/pelican,btnpushnmunky/pelican,treyhunner/pelican,alexras/pelican,gymglish/pelican,goerz/pelican,GiovanniMoretti/pelican,JeremyMorgan/pelican,zackw/pelican,eevee/pelican,sunzhongwei/pelican,florianjacob/pelican,gymglish/pelican,joetboole/pelican,farseerfc/pelican,zackw/pelican,51itclub/pelican,talha131/pelican,treyhunner/pelican,ehashman/pelican,Scheirle/pelican,TC01/pelican,Summonee/pelican,HyperGroups/pelican,kennethlyn/pelican,HyperGroups/pelican,eevee/pelican,number5/pelican,Polyconseil/pelican,deved69/pelican-1,deanishe/pelican,iKevinY/pelican,garbas/pelican,TC01/pelican,rbarraud/pelican,jvehent/pelican,lucasplus/pelican,douglaskastle/pelican,51itclub/pelican,janaurka/git-debug-presentiation,Scheirle/pelican,crmackay/pelican,zackw/pelican,janaurka/git-debug-presentiation,crmackay/pelican,catdog2/pelican,talha131/pelican,jvehent/pelican,HyperGroups/pelican,iKevinY/pelican,douglaskastle/pelican,janaurka/git-debug-presentiation,getpelican/pelican,GiovanniMoretti/pelican,karlcow/pelican,jo-tham/pelican,Summonee/pelican,avaris/pelican,11craft/pelican,jimperio/pelican,ls2uper/pelican,treyhunner/pelican,lucasplus/pelican,lazycoder-ru/pelican,kennethlyn/pelican,number5/pelican,UdeskDeveloper/pelican,avaris/pelican,deanishe/pelican,ingwinlu/pelican,Rogdham/pelican,lazycoder-ru/pelican,abrahamvarricatt/pelican,simonjj/pelican,crmackay/pelican,eevee/pelican,koobs/pelican,number5/pelican,jvehent/pelican,koobs/pelican,catdog2/pelican,simonjj/pelican,abrahamvarricatt/pelican,goerz/pelican,alexras/pelican,Rogdham/pelican,goerz/pelican,deanishe/pelican,abrahamvarricatt/pelican,Polyconseil/pelican,catdog2/pelican,alexras/pelican,jimperio/pelican,51itclub/pelican,UdeskDeveloper/pelican,deved69/pelican-1,garbas/pelican,douglaskastle/pelican,karlcow/pelican,ls2uper/pelican,sunzhongwei/pelican,sunzhongwei/pelican,kernc/pelican,iurisilvio/pelican,ls2uper/pelican,iurisilvio/pelican,btnpushnmunky/pelican,Summonee/pelican,ehashman/pelican,kernc/pelican,jo-tham/pelican,deved69/pelican-1,Rogdham/pelican,rbarraud/pelican,JeremyMorgan/pelican,JeremyMorgan/pelican,ehashman/pelican,levanhien8/pelican,sunzhongwei/pelican