In define mode in handle condition

[JSAbrahams]

Summary

• Don't allow return outside function
• Preserve variable defined in handle cond

Added Tests

Happy

• Handle based on README example

Sad

• Empty return outside function
• Return outside function

[codecov[bot]]

Codecov Report

Merging #390 (4d3d483) into v-0-3-5 (77d5b86) will increase coverage by 0.04%. The diff coverage is 88.23%.

@@             Coverage Diff             @@
##           v-0-3-5     #390      +/-   ##
===========================================
+ Coverage    87.07%   87.11%   +0.04%     
===========================================
  Files          109      109              
  Lines        12005    12013       +8     
===========================================
+ Hits         10453    10465      +12     
+ Misses        1552     1548       -4     

Impacted Files	Coverage Δ
tests/common.rs	38.46% <60.00%> (+1.92%)	:arrow_up:
src/check/constrain/generate/control_flow.rs	92.38% <100.00%> (ø)
src/check/constrain/generate/definition.rs	90.50% <100.00%> (+0.06%)	:arrow_up:
src/check/constrain/generate/env.rs	93.00% <100.00%> (+0.29%)	:arrow_up:
src/check/constrain/generate/statement.rs	85.10% <100.00%> (+1.01%)	:arrow_up:
src/parse/statement.rs	90.00% <100.00%> (ø)
src/check/context/clss/mod.rs	88.65% <0.00%> (+2.12%)	:arrow_up: