Consider `decl == NULL` case
[trivial] tweak code style
[Refactoring] Reduce use of variable 'a'
[Refactoring] Tweak token consumers

parseImport should return parsed `Import`s.
Add test for ddoc unittest feature (1)
Add test for ddoc unittest feature (2)
fix Issue 11677 - user defined attributes must be first

Parse prefix attributes in while loop of parseDeclDefs
fix Issue 11678 - user defined attributes cannot appear as postfixes
fix Issue 11679 - user defined attributes not allowed for local auto declarations
fix Issue 11680 - user defined attributes for type inference
Fix Issue 1553 - foreach_reverse is allowed for delegates

http://d.puremagic.com/issues/show_bug.cgi?id=1553
Issue 5498 - array of elements of subtypes of a common supertype

arrayExpressionsToCommonType incorrectly uses condexp.e2->type rather than condexp.type to determine the common type of the array.
fix Issue 4757 - A forward reference error with return of inner defined struct
Merge pull request #2924 from 9rnsr/fix_uda_parsing

Relax current limitations for UDA syntax parsing.
Use bool instead of char inside global.param
Completely ignore -quiet flag
Remove unused variable 'scheduler' from Param
Remove unused variable 'noboundscheck' from Param
Give doXGeneration and xfilename better names
Merge pull request #3367 from yebblies/param

[cleanup] Clean up parameters