diagnostics upgrade

compiler/ast/ast.odin

@@ -63,6 +63,14 @@ index :: proc(id: $T, invalid: T, count: int) -> (int, bool) {
 
 Type_Syntax :: types.Type
 
+Type_Use :: struct {
+	type: Type_Syntax,
+	span: source.Span,
+	pkg:  Package_Id,
+	file: File_Id,
+	diagnostic: source.Diagnostic_Id,
+}
+
 Expr_Kind :: enum u8 {
 	Invalid,
 	Integer,
@@ -325,6 +333,7 @@ Module :: struct {
 	c_trampolines: [dynamic]Trampoline,
 	strings:    [dynamic]string,
 	type_fields: [dynamic]types.Field,
+	type_uses:   [dynamic]Type_Use,
 	type_store: types.Store,
 	allocator:  mem.Allocator,
 }
@@ -345,6 +354,7 @@ init_module :: proc(allocator := context.allocator) -> Module {
 	module.c_trampolines.allocator = allocator
 	module.strings.allocator = allocator
 	module.type_fields.allocator = allocator
+	module.type_uses.allocator = allocator
 	return module
 }
 
@@ -397,5 +407,6 @@ destroy_module :: proc(module: ^Module) {
 	delete(module.c_trampolines)
 	delete(module.strings)
 	delete(module.type_fields)
+	delete(module.type_uses)
 	types.destroy_store(&module.type_store)
 }