>>68
#linesOfCode のソースはこんな感じ。コメントは含むが空行は除く。

CompiledMethod >> linesOfCode
　"An approximate measure of lines of code.
　Includes comments, but excludes empty lines."
　| lines |
　lines := 0.
　self getSource asString lineIndicesDo: [:start :endWithoutDelimiters :end |
　　endWithoutDelimiters > start ifTrue: [lines := lines+1]].
　^lines