Widen types on assignment checking
formatting generics support
Moving all diagnostics related code under core.
Report parse error when a type annotation is used in a catch clause.
Delete some accidental files
Updated draft of language specification
Update how we represent modifiers in the syntax model.
Fix issue with parsing members that have the same name as a modifier.
Fix parse failure.
Updating tests.
Deleting 'actual' files.
Reordering tests.
Disable the post-pass approach.  It tanks incremental performance too much.
Updating baselines.
Only do the post diagnostics pass when requesting diagnostics from the syntax tree.
Adding grammar checks for parameter lists.
Report errors for syntactically invalid parameters.
Grammar errors for index signatures.
Updating baselines.
Avoid unnecessary flagging of duplicate identifier errors