Log message:
libsass: updated to 3.6.0

Changelog
* Add functions utility compile unit
* Move macros and helpers to fn_utils
* Protect some header defines from redefining
* Move number functions to own compile unit
* Move selector functions to own compile unit
* Move color functions to own compile unit
* Move string functions to own compile unit
* Move list functions to own compile unit
* Move map functions to own compile unit
* Move misc functions to own compile unit
* Rename stacks to use shorter typedefs
* Cleanup CRTP implementation
* Rename ast2c and move c2ast to own compile unit
* Move AST memory macros to macro header
* Make Value inherit from PreValue
* Remove obsolete parameters
* Remove Function_Call_Schema class
* Remove obsolete in_selector flag
* Add distinct Parent_Reference class for values
* Fix parsing of colors (remove dynamic cast on eval)
* Pass traces instead of full context to bind
* Clean up get_arg_m in fn_utils
* Change String_Schema to only hold PreValue objects
* Clean up function macros and force to return PreValues
* Enhance stacktrace to report column numbers
* Add display name for color to debugger
* Add get method for environment class
* Remove obsolete function constructor arguments
* Add EnvStack typedef
* Replace direct references with methods
* Adjust output/error for modulo zero operation
* Adjust output/error for modulo zero operation
* Fix automake build if sassc is missing
* Upgrade sass2scss to version 1.1.2
* Allow colors in @at directives
* Fix edge case converting achromatic colors to HSL
* Delay interpolated expression as in regular CSS
* Fix automake build if sassc is missing
* Upgrade sass2scss to version 1.1.2
* Allow colors in @at directives
* Fix edge case converting achromatic colors to HSL
* Delay interpolated expression as in regular CSS
* Fix parsing of colors (remove dynamic cast on eval)
* Allow "!" in custom property values
* Allow "!" in custom property values
* Include Haskell bindings in implementations list
* Fix ordering in implementations list
* Fix link to node-sass implementation
* Separate out deprecated import file extensions
* Add a deprecation warning for @import's that resolved .css files
* Add support for index imports
* Add configuration for supporting additional extensions as .scss
* Remove raw css imports
* Inline out_of_memory macro
* Inline out_of_memory macro
* Emit transparent colors as rgba(0, 0, 0, 0)
* Fix merging of nested media queries with not
* Fix merging of nested media queries with not
* Fix regression in parsing selector with trailing escaped colon
* Fix regression in parsing selector with trailing escaped colon
* Emit transparent colors as rgba(0, 0, 0, 0)
* Add configuration for supporting additional extensions as .scss
* Remove raw css imports
* Mentioned SharpScss and LibSassHost in implementations.md
* Update compatibility section of the read me
* Fix segfault on empty custom properties
* Fix segfault on empty custom properties
* Include Haskell bindings in implementations list
* Fix ordering in implementations list
* Fix link to node-sass implementation
* Mentioned SharpScss and LibSassHost in implementations.md
* Revert "Upgrade sass2scss to version 1.1.2"
* Add deprecation messages for color arithmetic
* Add deprecation messages for color arithmetic
* Fix explosion of parent selectors in selector-nest
* Include in operation.hpp
* Adds another Nim implementation
* Update Readme.md
* Remove legacy workaround for parsing modulo operator
* Fix handling of unclosed interpolant in url
* Create CODE_OF_CONDUCT.md
* Revert "Remove raw css imports"
* Revert "Add configuration for supporting additional extensions as .scss"
* Revert "Add a deprecation warning for @import's that resolved .css files"
* Revert "Separate out deprecated import file extensions"
* Revert "Remove raw css imports"
* Revert "Add configuration for supporting additional extensions as .scss"
* Remove legacy workaround for parsing modulo operator
* Fix handling of unclosed interpolant in url
* Fix possible bug with handling empty reference combinators
* Fix -Wmissing-declarations for gcc < 7
* Support hex colors with alpha channels
* Make plugin tests run with a precision of 5
* Update make CC and CXX defaults for wider compat
* Update link to perl-libsass implementation
* Fix -Wmissing-declarations for gcc < 7
* Support hex colors with alpha channels
* Fix possible bug with handling empty reference combinators
* Update plugin test script to use precision 5
* Makefile: Use order-only deps for directories
* Use precision 10 by default
* Set default precision to 10 in Sass_Output_Options
* Docs: Profiling
* SharedPtr: Remove explicit detached bool
* Remove -undefined error, --no-undefined LDFLAGS
* SharedPtr: More cleanup
* Makefile cleanup
* Disable failing coverage check
* Fix ignored :not(multiple, selectors)
* Actually fix coveralls failures
* Use -std=c++11
* AST: Add final specifier to final classes
* Fix selector unification ordering
* Add and use a unification_order method
* Fix memory leak introduced in March
* Fix memory leak in resolve_parent_refs
* Revert "SharedPtr: More cleanup"
* Revert "SharedPtr: Remove explicit detached bool"
* AST: Fix clang warnings, add const, remove virtual
* .travis.yml: sudo: required for ptrace support
* Fix 2 more memory leaks
* Selector unification: use == for comparison
* Do not use 0 for initializing SharedImpl
* Add /plugins/ to .gitignore
* Fix a memory leak in rgba_2
* Travis ASan: Use default Travis clang (v5.0)
* Clean up Selector_List::operator==
* Fix heap-use-after-free in Parser error handling
* Optimize line_begin/end search in handle_error
* MSVC warning and fix
* Add a copy constructor to InvalidSass exception
* Minor fix: Reserve lists with correct sizes
* SharedPtr improvements
* Run C++ unit tests on CI (Makefile-only)
* Disallow parent selectors in selector-append
* Fix memory leak in parse_ie_keyword_arg
* Implement passing arguments to @content
* Clean up Compound_Selector::operator==
* Fix crash in selector-append('.x~~', 'a')
* Refactor: Add starts/ends_with functions
* Update utfcpp to v2.3.6
* Remove debugger from fn_miscs
* Move AST selectors into own compile units
* Move AST values into own compile units
* Fix clang warnings
* Cleanup and fix selector compare operators
* Rename element to type selector and type enums
* Replace to_string compare with == object compare
* Split AST declarations and definitions
* Move AST supports into own compile units
* Split AST declarations and definitions
* Cleanup AST values compare operators
* Fix clang warnings
* Refactor loops in Selector::unify_with
* Enable to read remote UNC locations on windows
* Re-implement selector unification
* Fix 2782: heap-use-after-free in expand.cpp
* Set without_rule flat only when explicitly requested by at_root
* Disallow optional pseudo_prefix
* Disallow parent selector in selector_fns arguments
* Refactor inspection/output of numbers
* Implement internal HSLA color representation
* Add deprecation for hsla with percentage alpha
* Fix number comparison for floats/doubles by calculations
* Fix VS2013 warning C4800 in src/ast_selectors.cpp
* Remove unused src/functions.{h,c}pp
* Catch exceptions by reference
* Simplify string concatenation
* indentation
* travis: Disable coverage for static OSX build
* Fixed typos
* Avoid clang warning: expression with side effects will be evaluated despite \ 
being used as an operand to 'typeid'
* Ensure sass.hpp is included before system headers
* Add comment about order to all sass.hpp includes
* https-ify sass-lang.com urls
* Fix broken markdown link
* Fix one more I missed due to faulty sed
* Install hrx gem in CI
* Install hrx gem in Windows CI
* Bump AppVeyor Ruby version
* Fix mixin-exists and function-exists in local scopes
* Avoid modifying Expression in ast_node_to_sass_value
* Remove _Ptr(_Const) typedefs
* Fix GCC warning: Catching polymorphic type by value
* Newlines: Parse \f and normalize in comments
* Make Makefile compatible with GNU Make >= 3.79.1
* Fix heap-use-after-free in eval.cpp
* Error on incomplete @supports clause in parser
* Fix invalid operator< for Selector_List
* Fix heap-buffer-overflow in prelexer.hpp:70
* Copy Unicode PWD tests from sass-spec
* Remove passing version flag to spec runner
* Remove unquoting for str_slice, str-insert and str-index
* Fix incorrect call to std::isdigit
* Remove obsolete unit tests
* Fix spec testing on mac with shared build
* Disallow non-string argument to quote
* Makefile: Mark test* targets as .PHONY
* Fix inspect for quoted strings
* Make parse_css_variable_value non-recursive
* Forbid empty custom property values
* Delete extconf.rb

Log message:
libsass: updated to 3.5.5

3.5.5 Vroom vroom:

Breaking
Revert changes to raw CSS @imports

Deprecations
Add deprecation messages for colour arithmetic

Features
Support hex colors with alpha channels
Add a sass_option_push_import_extension C-API

Fixes
Fix segfault in handling modulo operator
Fix handling of unclosed interpolant in url
Fix possible bug with handling empty reference combinators
Fix -Wmissing-declarations for gcc < 7

Log message:
libsass: updated to 3.5.4

3.5.4:
Revert sass2scss@v1.1.2 update

3.5.3:
Community
Add nim-sass to implementations list
Add Haskell bindings to implementations list
Add SharpScss and LibSassHost bindings to implementations list
Update node-sass link in implementations list
Update Unicode doc after forcing UTF8/plain ASCII
Update compatibility section of the read me

Features
Update sass2scss@v1.1.2
Emit transparent colours as rgba(0, 0, 0, 0)
Add a sass_option_push_import_extension C-API

Fixes
Fix output/error for modulo zero operation
Fix automake build if sassc is missing
Fix handling of colours in @at directives
Fix edge case converting achromatic colors to HSL
Fix evaluation of arithmetic inside interpolation
Fix handling of @important in custom properties
Fix duplicate definition of out_of_memory macro
Fix merging of nested media queries with negation
Fix regression in parsing selector with trailing escaped colon
Fix segfault on empty custom properties

3.5.2:
Features
Implement more detailed backtraces

Fixes
Fix parsing of block comments to ignore css string rules
Fix win UNC path handling for dot and dotdot directories

3.5.1:
Community
Add sass.cr to implementations list

Fixes
Fix compiler warnings
Fix double free when run in concurrent processes
Fix units sometimes being dropped in math operations
Fix missing error for mixins defined within mixins

Log message:
libsass: updated to 3.5.0

3.5.0:
Features
Implement trailing commas in parameters and arguments
Implement deprecation warning for ID strings that look like colors
Implement content-exists function
Implement support for passing var() to CSS functions
Implement first class functions
Implement nesting guard to avoid "out of stack space"
Implement exponents for numbers
Implement long file path support for Windows
Implement case modifier for attribute selector
Implement warning for double parent selectors
Implement support for custom property syntax
Implement support for custom-property feature flag

Optimisations
Performance improvements
Fix memory leak by removing previously unused code
Fix memory leak of custom functions signature

Community
Add libsass-python to Readme
Update link to go-libsass

Fixes
Fix media query stack and eval issue
Fix Attribute Selector equal compare operator
Fix segfault for varargs with non-string keys
Fix Element Selector compare operators
Fix compiler issue with spec regression on NetBSD 6.1
Fix some segfaults caused by the parser being too forgiving
Fix segfault with invalid map keys
Fix null pointer dereference in css_error
Fix bug when parsing selector schemas
Fix null pointer dereference when parsing selector schemas
Fix .editorconfig
Fix compiler issue with spec regression on NetBSD 6.1
Fix segfault when extending pseudo selectors failed
Fix parser for urls looking like ruleset selectors
Fix use of non-portable std::to_string
Fix use of non-portable strdup
Fix unary slash expressions
Fix missing error for trailing comma in selector list
Fix selector and binominal look ahead
Fix hex escape handling in interpolation
Fix wrong parsing of calc functions as number units
Fix incorrect comment evaluation for compressed output
Fix parent selector handling in selector schema
Fix parameter vararg and keyword handling
Fix a few minor memory leaks
Fix issue with invalid error indicator
Fix selector parsing and url regression
Fix null ptr segv on invalid vararg
Fix segfault in selector extend edge-case
Fix segfault in selector extend edge-case
Fix segfault in selector append edge-case
Fix ref-counted value handling in if function
Fix segfault in at-root cssize edge-case
Fix file content malloc to avoid reading beyond buffer
Fix case-sensitive lookup to named color map
Fix shebang for tap-driver
Fix segfault in parser edge case
Fix memory corruption on error in parse_selector_schema
Fix autoconf path for sassc tester
Fix output of invisible @support blocks
Fix to_value for bracketed lists
Fix propagation of named rest arguments
Fix @extend of wrapped selectors
Fix wrapped pseudo selector handling
Fix minor issue with attribute selector unification
Fix issue when passing restargs to call
Fix compressing of colors in selectors
Fix missing error on selector with invalid quote mark
Fix travis-ci mac OSX builds
Fix endless loop comparing Selector_List to List
Fix SmartOS/Solaris build regression
Fix to connect parent selector only once
Fix whitespace issue for wrapped selectors
Fix missing error if cwd goes missing
Fix missing error when mixin ruleset in root has parent selector
Fix sourcemap crutch once again
Fix parser state column following static values
Fix error indicator not being Unicode aware
Fix error sourcemaps not being fully Unicode aware
Fix some compiler warnings
Fix math with multiple units
Fix css test for interpolated numbers
Fix null pointer access in nesting check
Fix @else possibly producing invalid output
Fix parsing of @supports declarations

Log message:
libsass: updated to 3.4.9

3.4.9:
Fix math with multiple units
Make error indicator Unicode aware
Make sourcemaps fully Unicode aware
Fix parser state column following static values
Fix memory leak of custom functions signature
Adding the missing scope identifier std::
Fix fall-trough warning in latest gnu gcc
Tweak warning message format
Fix msvc compiler warning

Log message:
libsass: provided correct distinfo

Log message:
libsass/sassc: updated to 3.4.7

3.4.7:
Features
* Implement exponents for numbers
* Implement long file path support for Windows

Fixes
* Error on quoted string in simple selector parsing
* Do not compress colors in selectors
* Fix issue when passing restargs to call
* Fix issue with attribute selector unification
* Improve wrapped pseudo selector handling
* Improve extend of wrapped pseudo selectors
* Fix propagation of named rest arguments
* Do not output invisible support blocks
* Various build makefile and CI related fixes

Log message:
Update www/libsass to 3.4.5.

Features
- Implement trailing commas in parameters and arguments
- Implement unary slash expressions

Fixes
- Fix Attribute Selector equal compare operator
- Fix segfault for varargs with non-string keys
- Fix Element Selector compare operators
- Fix compiler issue with spec regression on NetBSD 6.1
- Fix some segfaults caused by the parser being too forgiving
- Fix segfault with invalid map keys
- Fix null pointer dereference in css_error
- Fix bug when parsing selector schemas
- Fix null pointer dereference in parse_selector_schema
- Fix segfault when extending pseudo selectors failed
- Fix parser for urls looking like ruleset selectors
- Error for trailing rulesets comma
- Improve selector and binominal look ahead
- Improve hex escape handling in interpolation
- Fix wrong parsing of calc functions as number units
- Skip comment evaluation for compressed output
- Improve parent selector handling in selector schema
- Improve parameter vararg and keyword handling
- Hotfix to avoid invalid nested :not selectors
- Fix a few minor memory leaks

Log message:
Changes 3.4.4:
Features
* Update Visual Studio build facade
* Update read me
* Performance improvements for @extend
* Performance improvements

Fixes
Disable FMA3 when compiling with Visual Studio 2013
Fix for loop variable to be referenced
Fix number compare issues when used as map keys with old gcc
Fix results of map-get not being evaluated
Fix null pointer access
Fix bug with media queries and @extend

Misc
Cleanup initial shared ptr interface
Refactor selector list and schema handling
Cleanup context usage and extend code
Cleanup misc
Cleanup issues detected by clangs static analyser
Remove Textual intermediate AST node
Add libsass-python to README

Log message:
Changes 3.4.0:

Over the last couple years we've worked very closely with the Ruby Sass team to
reach Sass 3.4 compatibility.

It's become clear that need to draw a line in sand with exactly how exactly
we can match Sass 3.4, especially in the face of changes in Sass 3.5.

With this release the LibSass team is marking the completion of active
development on Sass 3.4 compatibility. From today we'll focus our efforts on
Sass 3.5 compatibility, first prioritising CSS compatibility features like
support for CSS custom property and CSS grids.