Fix for detecting call heads in function signatures

[c42f]

Discovered parsing packages in General (NDTensors in particular)

[codecov[bot]]

Codecov Report

Merging #247 (a76ad70) into main (bc8bd78) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
+ Coverage   96.42%   96.47%   +0.05%     
==========================================
  Files          15       15              
  Lines        3917     3919       +2     
==========================================
+ Hits         3777     3781       +4     
+ Misses        140      138       -2     

Impacted Files	Coverage Δ
src/parse_stream.jl	96.32% <100.00%> (+0.43%)	:arrow_up:
src/parser.jl	98.25% <100.00%> (+<0.01%)	:arrow_up:

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