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First cut of the qualified-alias-member feature.
* cs-tokenizer.cs (Tokenizer.is_punct): Recognize the double-colon
token.
* cs-parser.jay (DOUBLE_COLON): New token.
(namespace_or_type_name): Add rule for recognizing
qualified-alias-members.
(primary_expression): Likewise.
(element_access): Allow QualifiedAliasMember as a possible
type-bearing expression.
(local_variable_type, local_variable_pointer_type): Likewise.
* namespace.cs (NamespaceEntry.LookupAlias): New. Looks up
aliases in the current and enclosing namespace declarations.
(NamespaceEntry.UsingAlias): Add CS0440 warning.
* decl.cs (MemberName.is_double_colon): New.
(MemberName.MemberName): Add new constructor for alias-member.
(MemberName.GetTypeExpression): Generate QualifiedAliasMember too.
* expression.cs (QualifiedAliasMember): New expression type.
In errors:
* cs0431.cs, cs0432.cs, cs0432-2.cs, cs0440.cs, cs0687.cs:
New tests for the qualified-alias-member (::) feature.
In tests:
* test-426.cs, test-427.cs, test-428.cs, test-429.cs,
test-430.cs, test-431.cs, test-432.cs, test-433.cs,
test-434.cs, test-435.cs, test-436.cs: New tests for the
qualified-alias-member (::) feature.
svn path=/trunk/mcs/; revision=47931
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