Parser: improve handling of mixed tags and anchors

[biojppm]

No description provided.

[codecov]

Codecov Report

Merging #71 into master will increase coverage by 0.24%.
The diff coverage is 97.76%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   93.87%   94.12%   +0.24%     
==========================================
  Files          59       59              
  Lines        6239     6468     +229     
==========================================
+ Hits         5857     6088     +231     
+ Misses        382      380       -2     

Impacted Files	Coverage Δ
src/c4/yml/detail/stack.hpp	100.00% <ø> (ø)
src/c4/yml/parse.hpp	100.00% <ø> (ø)
test/simple_anchor.cpp	100.00% <ø> (ø)
test/simple_doc.cpp	100.00% <ø> (ø)
test/simple_set.cpp	100.00% <ø> (ø)
test/suite.cpp	97.40% <ø> (-0.44%)	⬇️
test/tag_property.cpp	100.00% <ø> (ø)
src/c4/yml/parse.cpp	90.99% <95.08%> (+0.35%)	⬆️
src/c4/yml/tree.cpp	93.40% <98.70%> (+0.42%)	⬆️
src/c4/yml/emit.def.hpp	95.04% <100.00%> (+1.42%)	⬆️
... and 8 more

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