Add missing location of argument in named tuple type

`foo: Bar` in `x : {foo: Bar}`

spec/compiler/parser/parser_spec.cr

@@ -2601,5 +2601,11 @@ module Crystal
       node = Parser.parse(source).as(MultiAssign).targets[1]
       node_source(source, node).should eq("*bar")
     end
+
+    it "sets correct location of argument in named tuple type" do
+      source = "x : {foo: Bar}"
+      node = Parser.parse(source).as(TypeDeclaration).declared_type.as(Generic).named_args.not_nil![0]
+      node_source(source, node).should eq("foo: Bar")
+    end
   end
 end

src/compiler/crystal/syntax/parser.cr

@@ -5157,7 +5157,7 @@ module Crystal
         type = parse_bare_proc_type
         skip_space
 
-        named_args << NamedArgument.new(name, type)
+        named_args << NamedArgument.new(name, type).at(name_location).at_end(type)
 
         if @token.type.op_comma?
           next_token_skip_space_or_newline