parser: fix variadic end comma

[visualfc]

fix https://play.goplus.org/p/eJyGvfHGjjD

println(
	a...,
)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (841741a) 91.92% compared to head (4b9fe90) 91.92%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1709      +/-   ##
==========================================
- Coverage   91.92%   91.92%   -0.01%     
==========================================
  Files          39       39              
  Lines       10775    10774       -1     
==========================================
- Hits         9905     9904       -1     
  Misses        704      704              
  Partials      166      166              

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[xushiwei]

NOTE: bug introduced by ea555ec