Fix #21.

[sisshiki1969]

This PR fixes #21.

[codecov]

Codecov Report

Merging #22 (26dceef) into master (c30fef8) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   89.38%   89.41%   +0.03%     
==========================================
  Files          90       90              
  Lines       28910    28970      +60     
==========================================
+ Hits        25840    25904      +64     
+ Misses       3070     3066       -4     

Files	Coverage Δ
monoruby/src/executor.rs	84.17% <100.00%> (+0.07%)	⬆️
monoruby/src/executor/compiler/jitgen.rs	93.79% <100.00%> (+0.03%)	⬆️
monoruby/src/executor/compiler/jitgen/constants.rs	100.00% <100.00%> (ø)
monoruby/src/executor/compiler/vmgen/variables.rs	100.00% <100.00%> (ø)
monoruby/src/globals/store.rs	95.06% <100.00%> (ø)
monoruby/src/globals/store/class/constants.rs	92.72% <100.00%> (+1.06%)	⬆️
monoruby/src/tests.rs	99.60% <100.00%> (+<0.01%)	⬆️
monoruby/src/value/rvalue/module.rs	90.58% <100.00%> (ø)

... and 1 file with indirect coverage changes

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