New Language Features

• C# 7.0: Deconstruction
• C# 8.0: await foreach
• C# 8.0: Disposable ref structs
• C# 8.0: Enhanced using statements
• C# 8.0: switch expressions
• C# 9.0: init accessors
• C# 9.0: Lambda parameter discards

General

• Add an option to enable aggressive inlining of expressions.
• Add an option to always qualify member references (by @Pathoschild, see #2114)
• ReadyToRun: Variable tracking in output (by @edkazcarlson, see #2067)
• ReadyToRun: Optimized debug info output (by @cshung, see #2113)
• Work on unifying the code formatting (see #2128)

UI Improvements

• Updated Chinese translation (by @maikebing, @Berrysoft, @yyjdelete, see #2066)
• Fix #2107: Add ScrollViewer around DisplaySettingsPanel

Bug fixes

• Fix #2086: Check that window belongs to ILSpy before sending it a WM_COPYDATA message.
• Fix #2090: ignore mscorlib references without public key token, when trying to resolve mscorlib. This will automatically fallback to .NET 4.0's mscorlib.dll.
• #1292: Fix some more problems with pinned locals.
• Fix #1555: Eliminate value-type temporaries emitted by mcs on field reads.
• Fix #2056: "remove branch into body" must be executed before the clone cleanup
• Fix #2101: reset removeExtraLoad flag if keepAssignmentBefore is set; implement simple case-de-duplication: abort if there are any duplicate cases.
• Fix #2100: 'value'-named auto property could not be recognized correctly.
• Fix #1441: Decompose flags enum values starting from the value with the highest Hamming Weight (popcount).
• And many other fixes, for a full list click here.