diff --git a/Sources/CoreKit/Guarantee+Validation.swift b/Sources/CoreKit/Guarantee+Validation.swift
index cb9f37c8..a8c3e62b 100644
--- a/Sources/CoreKit/Guarantee+Validation.swift
+++ b/Sources/CoreKit/Guarantee+Validation.swift
@@ -48,7 +48,7 @@ extension Guarantee {
     ///
     /// - Requires: The given `value` must satisfy the `predicate` of this type.
     ///
-    @inlinable public init<Error>(_ value: consuming Value, prune error: @autoclosure () -> Error) throws where Error: Swift.Error {
+    @inlinable public init<Error>(_ value: consuming Value, prune error: @autoclosure () -> Error) throws(Error) {
         guard Self.predicate(value) else { throw error() }
         self.init(unsafe:/**/value)
     }
diff --git a/Sources/CoreKit/Models/Fallible+Validation.swift b/Sources/CoreKit/Models/Fallible+Validation.swift
index cc29bf51..64d34be0 100644
--- a/Sources/CoreKit/Models/Fallible+Validation.swift
+++ b/Sources/CoreKit/Models/Fallible+Validation.swift
@@ -31,19 +31,19 @@ extension Fallible {
         }
     }
     
-    /// Tries to return its `value` but throws `failure()` on `error`.
-    @inlinable public consuming func prune<Error>(_ failure: @autoclosure () -> Error) throws(Error) -> Value {
+    /// Tries to return its `value` but throws `error()` on `error`.
+    @inlinable public consuming func prune<Error>(_ error: @autoclosure () -> Error) throws(Error) -> Value {
         if  self.error {
-            throw  failure()
+            throw  error()
         }   else {
             return self.value
         }
     }
     
-    /// Tries to return its `value` but returns `failure()` on `error`.
-    @inlinable public consuming func result<Error>(_ failure: @autoclosure () -> Error) -> Result<Value, Error> {
+    /// Tries to return its `value` but returns `error()` on `error`.
+    @inlinable public consuming func result<Error>(_ error: @autoclosure () -> Error) -> Result<Value, Error> {
         if  self.error {
-            return Result.failure(failure())
+            return Result.failure(error())
         }   else {
             return Result.success(self.value)
         }