Welcome the stable 3.5 LibSass release 🎉 🎉 🎉

This release contains most Sass 3.5 features, and many many bug fixes and optimisations.

Features

• Implement trailing commas in parameters and arguments (#2070, @xzyfer)
• Implement deprecation warning for ID strings that look like colors (#2302, @xzyfer)
• Implement content-exists function (#2266, @xzyfer)
• Implement support for passing var() to CSS functions (#2244, @xzyfer)
• Implement first class functions (#2277 #2275, @xzyfer)
• Implement nesting guard to avoid "out of stack space" (#2438, @mgreter)
• Implement exponents for numbers (#2465, @mgreter)
• Implement long file path support for Windows (#2477, @mgreter)
• Implement case modifier for attribute selector (#2509, @mgreter)
• Implement warning for double parent selectors (#2522, @mgreter)
• Implement support for custom property syntax (#2076, @xzyfer)
• Implement support for custom-property feature flag (#2076, @xzyfer)

Optimisations

• Performance improvements (#2339, @mgreter)
• Fix memory leak by removing previously unused code (#2505, @mgreter)
• Fix memory leak of custom functions signature (#2553, @mgreter)

Community

• Add libsass-python to Readme (#2546, @asottile)
• Update link to go-libsass (#2340 #2410, @drewwells)

Fixes

• Fix media query stack and eval issue (#2341, @mgreter)
• Fix Attribute Selector equal compare operator (#2347, @mgreter)
• Fix segfault for varargs with non-string keys (#2352, @mgreter)
• Fix Element Selector compare operators (#2347, @mgreter)
• Fix compiler issue with spec regression on NetBSD 6.1 (#2357, @mgreter)
• Fix some segfaults caused by the parser being too forgiving (#2367, @xzyfer)
• Fix segfault with invalid map keys (#2368, @xzyfer)
• Fix null pointer dereference in css_error (#2369, @xzyfer)
• Fix bug when parsing selector schemas (#2371, @xzyfer)
• Fix null pointer dereference when parsing selector schemas (#2371, @2372)
• Fix .editorconfig (#2380, @brucek)
• Fix compiler issue with spec regression on NetBSD 6.1 (#2357, @mgreter)
• Fix segfault when extending pseudo selectors failed (#2366, @mgreter)
• Fix parser for urls looking like ruleset selectors (#2376, @mgreter)
• Fix use of non-portable std::to_string (#2385, @mgreter)
• Fix use of non-portable strdup (#2459, @asottile)
• Fix unary slash expressions (#2349 #2384, @mgreter)
• Fix missing error for trailing comma in selector list (#2365, @mgreter)
• Fix selector and binominal look ahead (#2346, @mgreter)
• Fix hex escape handling in interpolation (#2320, @mgreter)
• Fix wrong parsing of calc functions as number units (#2382, @mgreter)
• Fix incorrect comment evaluation for compressed output (#2359, @mgreter)
• Fix parent selector handling in selector schema (#2358, @mgreter)
• Fix parameter vararg and keyword handling (#2394, @mgreter)
• Fix a few minor memory leaks (#2400, @mgreter)
• Fix issue with invalid error indicator (#2404, @mgreter)
• Fix selector parsing and url regression (#2429, @mgreter)
• Fix null ptr segv on invalid vararg (#2437, @mgreter)
• Fix segfault in selector extend edge-case (#2437, @mgreter)
• Fix segfault in selector extend edge-case (#2437, @mgreter)
• Fix segfault in selector append edge-case (#2437, @mgreter)
• Fix ref-counted value handling in if function (#2437, @mgreter)
• Fix segfault in at-root cssize edge-case (#2439, @mgreter)
• Fix file content malloc to avoid reading beyond buffer (#2440, @mgreter)
• Fix case-sensitive lookup to named color map (#2462, @asottile)
• Fix shebang for tap-driver (#2466, @naroga)
• Fix segfault in parser edge case (#2446, @mgreter)
• Fix memory corruption on error in parse_selector_schema (#2484, @mgreter)
• Fix autoconf path for sassc tester (#2492, @mgreter)
• Fix output of invisible @support blocks (#2488, @mgreter)
• Fix to_value for bracketed lists (#2467, @mgreter)
• Fix propagation of named rest arguments (#2480, @mgreter)
• Fix @extend of wrapped selectors (#2468, @mgreter)
• Fix wrapped pseudo selector handling (#2464 #2383, @mgreter)
• Fix minor issue with attribute selector unification (#2053, @mgreter)
• Fix issue when passing restargs to call (#2472, @mgreter)
• Fix compressing of colors in selectors (#2232, @mgreter)
• Fix missing error on selector with invalid quote mark (#2082, @mgreter)
• Fix travis-ci mac OSX builds (#2527, @mgreter)
• Fix endless loop comparing Selector_List to List (#2516 #2517, @mgreter)
• Fix SmartOS/Solaris build regression (#2519, @mgreter)
• Fix to connect parent selector only once (#2520, @mgreter)
• Fix whitespace issue for wrapped selectors (#2366, @mgreter)
• Fix missing error if cwd goes missing (#2513, @mgreter)
• Fix missing error when mixin ruleset in root has parent selector (#2482, @mgreter)
• Fix sourcemap crutch once again (#2312, @mgreter)
• Fix parser state column following static values (#2542, @mgreter)
• Fix error indicator not being Unicode aware (#2404, @mgreter)
• Fix error sourcemaps not being fully Unicode aware (#2319, @mgreter)
• Fix some compiler warnings (#2547, @mgreter)
• Fix math with multiple units (#2549, @mgreter)
• Fix css test for interpolated numbers (#2560, @mgreter)
• Fix null pointer access in nesting check (sass/sassc#222 sass/sassc#223, @mgreter)
• Fix @else possibly producing invalid output (#2569, @xzyfer)
• Fix parsing of @supports declarations (#2452, @xzyfer)