diff --git a/src/spectator/expectations/expectation.cr b/src/spectator/expectations/expectation.cr
index 0a11616..5621998 100644
--- a/src/spectator/expectations/expectation.cr
+++ b/src/spectator/expectations/expectation.cr
@@ -30,12 +30,12 @@ module Spectator::Expectations
     end
 
     # Describes the condition that must be met for the expectation to be satisifed.
-    private def message : String
+    private def message
       @matcher.message(@partial)
     end
 
     # Describes the condition under which the expectation won't be satisifed.
-    private def negated_message : String
+    private def negated_message
       @matcher.negated_message(@partial)
     end
   end
diff --git a/src/spectator/matchers/case_matcher.cr b/src/spectator/matchers/case_matcher.cr
index 842bf3b..46a46b3 100644
--- a/src/spectator/matchers/case_matcher.cr
+++ b/src/spectator/matchers/case_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct CaseMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       expected === partial.actual
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to semantically equal #{label} (using ===)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not semantically equal #{label} (using ===)"
     end
   end
diff --git a/src/spectator/matchers/empty_matcher.cr b/src/spectator/matchers/empty_matcher.cr
index 4dd192f..a4889b5 100644
--- a/src/spectator/matchers/empty_matcher.cr
+++ b/src/spectator/matchers/empty_matcher.cr
@@ -11,19 +11,19 @@ module Spectator::Matchers
 
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual.empty?
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be empty"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be empty"
     end
   end
diff --git a/src/spectator/matchers/equality_matcher.cr b/src/spectator/matchers/equality_matcher.cr
index d5da3f7..e883e7c 100644
--- a/src/spectator/matchers/equality_matcher.cr
+++ b/src/spectator/matchers/equality_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct EqualityMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual == expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to equal #{label} (using ==)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not equal #{label} (using ==)"
     end
   end
diff --git a/src/spectator/matchers/greater_than_equal_matcher.cr b/src/spectator/matchers/greater_than_equal_matcher.cr
index 046e13d..90c552f 100644
--- a/src/spectator/matchers/greater_than_equal_matcher.cr
+++ b/src/spectator/matchers/greater_than_equal_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct GreaterThanEqualMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual >= expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be greater than or equal to #{label} (using >=)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be greater than or equal to #{label} (using >=)"
     end
   end
diff --git a/src/spectator/matchers/greater_than_matcher.cr b/src/spectator/matchers/greater_than_matcher.cr
index 538cbe6..daffca7 100644
--- a/src/spectator/matchers/greater_than_matcher.cr
+++ b/src/spectator/matchers/greater_than_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct GreaterThanMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual > expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be greater than #{label} (using >)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be greater than #{label} (using >)"
     end
   end
diff --git a/src/spectator/matchers/inequality_matcher.cr b/src/spectator/matchers/inequality_matcher.cr
index f17319b..029eade 100644
--- a/src/spectator/matchers/inequality_matcher.cr
+++ b/src/spectator/matchers/inequality_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct InequalityMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual != expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to not equal #{label} (using !=)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to equal #{label} (using !=)"
     end
   end
diff --git a/src/spectator/matchers/less_than_equal_matcher.cr b/src/spectator/matchers/less_than_equal_matcher.cr
index a399088..692ec55 100644
--- a/src/spectator/matchers/less_than_equal_matcher.cr
+++ b/src/spectator/matchers/less_than_equal_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct LessThanEqualMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual <= expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be less than or equal to #{label} (using <=)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be less than or equal to #{label} (using <=)"
     end
   end
diff --git a/src/spectator/matchers/less_than_matcher.cr b/src/spectator/matchers/less_than_matcher.cr
index b82a50a..b7120cd 100644
--- a/src/spectator/matchers/less_than_matcher.cr
+++ b/src/spectator/matchers/less_than_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct LessThanMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual < expected
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be less than #{label} (using <)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be less than #{label} (using <)"
     end
   end
diff --git a/src/spectator/matchers/nil_matcher.cr b/src/spectator/matchers/nil_matcher.cr
index 1601857..d40ed1e 100644
--- a/src/spectator/matchers/nil_matcher.cr
+++ b/src/spectator/matchers/nil_matcher.cr
@@ -11,19 +11,19 @@ module Spectator::Matchers
 
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual.nil?
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be nil"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be nil"
     end
   end
diff --git a/src/spectator/matchers/range_matcher.cr b/src/spectator/matchers/range_matcher.cr
index 5a28dc5..8351f8f 100644
--- a/src/spectator/matchers/range_matcher.cr
+++ b/src/spectator/matchers/range_matcher.cr
@@ -8,19 +8,19 @@ module Spectator::Matchers
   struct RangeMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       @expected.includes?(partial.actual)
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be in #{label}"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be in #{label}"
     end
 
diff --git a/src/spectator/matchers/regex_matcher.cr b/src/spectator/matchers/regex_matcher.cr
index 80d4fdf..9993401 100644
--- a/src/spectator/matchers/regex_matcher.cr
+++ b/src/spectator/matchers/regex_matcher.cr
@@ -6,19 +6,19 @@ module Spectator::Matchers
   struct RegexMatcher(ExpectedType) < ValueMatcher(ExpectedType)
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       !!(partial.actual =~ expected)
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to match #{label} (using =~)"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not match #{label} (using =~)"
     end
   end
diff --git a/src/spectator/matchers/truthy_matcher.cr b/src/spectator/matchers/truthy_matcher.cr
index f7c8444..102af74 100644
--- a/src/spectator/matchers/truthy_matcher.cr
+++ b/src/spectator/matchers/truthy_matcher.cr
@@ -18,20 +18,20 @@ module Spectator::Matchers
 
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       # Cast value to truthy value and compare.
       @expected == !!partial.actual
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be #{label}"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be #{label}"
     end
 
diff --git a/src/spectator/matchers/type_matcher.cr b/src/spectator/matchers/type_matcher.cr
index 3c07629..6c94b27 100644
--- a/src/spectator/matchers/type_matcher.cr
+++ b/src/spectator/matchers/type_matcher.cr
@@ -12,19 +12,19 @@ module Spectator::Matchers
 
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
-    def match?(partial) : Bool
+    def match?(partial)
       partial.actual.is_a?(Expected)
     end
 
     # Describes the condition that satisfies the matcher.
     # This is informational and displayed to the end-user.
-    def message(partial) : String
+    def message(partial)
       "Expected #{partial.label} to be a #{label}"
     end
 
     # Describes the condition that won't satsify the matcher.
     # This is informational and displayed to the end-user.
-    def negated_message(partial) : String
+    def negated_message(partial)
       "Expected #{partial.label} to not be a #{label}"
     end
   end