fix #232 - Problem with single lines WithStatement

[ghost]

I cant find a legit use case but DMD accepts and compiles the construct.

[codecov]

Codecov Report

Merging #233 into master will increase coverage by 3.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
+ Coverage   81.98%   85.03%   +3.05%     
==========================================
  Files           7        7              
  Lines        4662     5760    +1098     
==========================================
+ Hits         3822     4898    +1076     
- Misses        840      862      +22

Impacted Files	Coverage Δ
src/dparse/ast.d	14.95% <ø> (ø)	⬆️
src/dparse/parser.d	90.68% <100%> (+2.71%)	⬆️

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