Fix for issue #4

src/spectator/dsl/matcher_dsl.cr

@@ -517,7 +517,7 @@ module Spectator::DSL
     # expect { raise ArgumentError.new("foobar") }.to raise_error(ArgumentError, "foobar")
     # ```
     macro raise_error(type, message)
-      ::Spectator::Matchers::ExceptionMatcher.new({{type}}, {{message}}, {{message.stringify}})
+      ::Spectator::Matchers::ExceptionMatcher.create({{type}}, {{message}}, {{message.stringify}})
     end
 
     # Indicates that some block should raise an error.

src/spectator/matchers/exception_matcher.cr

@@ -57,6 +57,11 @@ module Spectator::Matchers
       ExceptionMatcher(Exception, typeof(expected)).new(expected, label)
     end
 
+    # Creates a new exception matcher with a type and message check.
+    def self.create(exception_type : T.class, expected, label : String) forall T
+      ExceptionMatcher(T, typeof(expected)).new(expected, label)
+    end
+
     # Match data specific to this matcher.
     private struct MatchData(ExceptionType, ExpectedType, ActualType) < MatchData
       # Creates the match data.