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Indentation is visible. Conservatively estimated, tens to hundreds of thousands of programmers don't have any real problem with syntax based on indentation.

• nailer 11y ago
  You could also measure non programmers (they lack bias) and get real numbers on whether adding parenthesis helps.
  • pekk 11y ago
    I don't see how these numbers would be more real than measuring programmers at work, unless you intend to help non-programmers write programs.