tests/RedundantNewKeyword: new 'let' testcase

Unlike with `use`, in case of `let` binding, usage of `new`
on unresolved type should fire the rule.

Author: webwarrior-ws

tests/FSharpLint.Core.Tests/Rules/Conventions/RedundantNewKeyword.fs

@@ -86,3 +86,14 @@ module Program
 
         Assert.IsFalse this.ErrorsExist
 
+    [<Test>]
+    member this.``unresolved type with 'let' should give rule violations``() =
+        this.Parse """
+module Program
+    let SomeFunc() =
+        let foo = new UnresolvedType()
+        foo.Foo
+"""
+
+        Assert.IsTrue this.ErrorsExist
+