Convert Tree.children from Iterable to Iterator

[cacay]

No description provided.

[codecov]

Codecov Report

Merging #513 (4a48ef0) into master (01ff479) will decrease coverage by 0.05%.
The diff coverage is 78.94%.

@@             Coverage Diff              @@
##             master     #513      +/-   ##
============================================
- Coverage     63.06%   63.00%   -0.06%     
+ Complexity     1238     1237       -1     
============================================
  Files           253      254       +1     
  Lines          9854     9866      +12     
  Branches       1430     1437       +7     
============================================
+ Hits           6214     6216       +2     
- Misses         3375     3377       +2     
- Partials        265      273       +8     

Impacted Files	Coverage Δ
.../github/apl_cornell/viaduct/util/PersistentSets.kt	33.33% <33.33%> (ø)
...ub/apl_cornell/viaduct/syntax/intermediate/Node.kt	57.14% <50.00%> (ø)
...cornell/viaduct/syntax/intermediate/Expressions.kt	97.59% <60.00%> (-2.41%)	⬇️
...iaduct/syntax/intermediate/TopLevelDeclarations.kt	92.98% <66.66%> (-3.32%)	⬇️
..._cornell/viaduct/syntax/intermediate/Statements.kt	97.13% <80.95%> (-1.62%)	⬇️
...ithub/apl_cornell/viaduct/analysis/NameAnalysis.kt	69.00% <83.33%> (-0.13%)	⬇️
...ithub/apl_cornell/viaduct/analysis/Declarations.kt	89.36% <100.00%> (ø)
...uct/analysis/OutParameterInitializationAnalysis.kt	90.24% <100.00%> (-0.12%)	⬇️
...ithub/apl_cornell/viaduct/attributes/Attributes.kt	100.00% <100.00%> (ø)
.../io/github/apl_cornell/viaduct/attributes/Trees.kt	77.27% <100.00%> (ø)
... and 4 more

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