fix: fix endless loop in variable resolving

[codecov-commenter]

Codecov Report

Merging #41 (adc0972) into main (ddb2c42) will increase coverage by 1.28%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #41      +/-   ##
============================================
+ Coverage     81.44%   82.73%   +1.28%     
- Complexity      969      970       +1     
============================================
  Files            45       45              
  Lines          2161     2444     +283     
============================================
+ Hits           1760     2022     +262     
- Misses          401      422      +21     

Impacted Files	Coverage Δ
src/DefinitionResolver.php	87.02% <100.00%> (+0.81%)	:arrow_up:
src/LanguageServer.php	79.20% <0.00%> (-1.18%)	:arrow_down:
src/Index/Index.php	73.64% <0.00%> (-1.16%)	:arrow_down:
src/CompletionProvider.php	94.23% <0.00%> (-0.21%)	:arrow_down:
src/Client/Workspace.php	100.00% <0.00%> (ø)
src/Cache/ClientCache.php	0.00% <0.00%> (ø)
src/Client/TextDocument.php	100.00% <0.00%> (ø)
src/Factory/RangeFactory.php	100.00% <0.00%> (ø)
src/ProtocolStreamReader.php	100.00% <0.00%> (ø)
src/Client/WorkDoneProgress.php	100.00% <0.00%> (ø)
... and 19 more