Semantic Indentation is an actively used design pattern.

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Languages without Semantic Indentation include go, julia, kotlin, rust, swift

Languages with Semantic Indentation include abc, aldor, boo, buddyscript, cobra, coffeescript, csl, curry, elixir, f-sharp, genie, haml, haskell, i-expressions, inform, iswim, literate-coffeescript, livescript, madcap-vi, madcap, makefile, markdown, miranda, nemerle, net-format, nim, occam, org, promal, purescript, python, restructuredtext, sass, scss, spin, stylus, sweet-expressions, wisp, xl-programming-language, yaml

Example from purescript:

-- https://github.com/purescript/documentation/blob/master/language/Syntax.md
-- Syntax is whitespace sensitive. The general rule of thumb is that declarations which span multiple lines should be indented past the column on which they were first defined on their subsequent lines.
foo = bar +
 baz

Last updated July 8th, 2019