Fix singleton class nesting when inside top level reference #2471
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Motivation
Fixes the bug reported in #2287 (comment)
We need to use our proper nesting resolution
actual_nesting
to discover the correct place where we discovered a singleton class, just like we're doing for regular classes. Otherwise, we incorrectly insert a name prefixed with::
in the index state, which we do not want.Implementation
Started using our
actual_nesting
method to figure out the right nesting.Automated Tests
Added a test.