fix: accept record method declaration for nested records

Fixes #648.

spec/declaration/record_method_spec.lua

@@ -50,6 +50,20 @@ describe("record method", function()
       local ok = r.z:f(3, "abc")
    ]]))
 
+   it("nested declaration for record (regression test for #648)", util.check([[
+      local record Math
+         record Point
+            x: number
+            y: number
+         end
+      end
+
+      function Math.Point:move(dx: number, dy: number)
+         self.x = self.x + dx
+         self.y = self.y + dy
+      end
+   ]]))
+
    it("nested declaration in {}", util.check([[
       local r = {
          z = {},

tl.lua

@@ -8062,7 +8062,8 @@ tl.type_check = function(ast, opts)
             return nil, nil, dname
          end
          t = t and t.fields and t.fields[fname]
-         return t, v, dname
+
+         return t.def or t, v, dname
       end
    end
 

tl.tl

@@ -8062,7 +8062,8 @@ tl.type_check = function(ast: Node, opts: TypeCheckOptions): Result, string
             return nil, nil, dname
          end
          t = t and t.fields and t.fields[fname]
-         return t, v, dname
+
+         return t.def or t, v, dname
       end
    end