Fix and support windows drive letters for root folders

src/compiler/crystal/tools/typer.cr

@@ -508,19 +508,12 @@ module Crystal
           @line_locators << loc[0] unless loc["col_number"]?
           @line_and_column_locators << loc[0] if loc["line_number"]? && loc["col_number"]?
         end
-
-        pp! @dir_locators
-        pp! @file_locators
-        pp! @line_locators
-        pp! @line_and_column_locators
       end
 
       def visit(node : Crystal::Def)
         return false unless loc = node.location
         return false unless loc.filename && loc.line_number && loc.column_number
-        pp! loc
         if node_in_def_locators(loc)
-          puts "Accepted"
           all_defs << node
           files << loc.filename.to_s
         end
@@ -533,7 +526,7 @@ module Crystal
       end
 
       private def node_in_def_locators(location : Crystal::Location) : Bool
-        return false unless location.to_s.starts_with?("/")
+        return false unless location.to_s.starts_with?("/") || location.to_s.starts_with?(/\w:/)
         return true if @dir_locators.any? { |d| location.filename.to_s.starts_with?(d) }
         return true if @file_locators.includes?(location.filename)
         return true if @line_locators.includes?("#{location.filename}:#{location.line_number}")