[CI] Use the latest Swift 5.1 snapshot

.travis.yml

@@ -48,7 +48,7 @@ matrix:
     - <<: *swiftpm_linux
       name: SwiftPM / Linux / Swift 5.1 Development
       env:
-        - SWIFT_VERSION=5.1-DEVELOPMENT-SNAPSHOT-2019-04-17-a
+        - SWIFT_VERSION=5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a
 install: true
 script:
   - ./test $TYPE

Sources/Nimble/Matchers/BeGreaterThan.swift

@@ -11,6 +11,11 @@ public func beGreaterThan<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
     }
 }
 
+public func ><T: Comparable>(lhs: Expectation<T>, rhs: T) {
+    lhs.to(beGreaterThan(rhs))
+}
+
+#if canImport(Darwin) || !compiler(>=5.1)
 /// A Nimble matcher that succeeds when the actual value is greater than the expected value.
 public func beGreaterThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparable> {
     let errorMessage = "be greater than <\(stringify(expectedValue))>"
@@ -22,13 +27,10 @@ public func beGreaterThan(_ expectedValue: NMBComparable?) -> Predicate<NMBCompa
     }
 }
 
-public func ><T: Comparable>(lhs: Expectation<T>, rhs: T) {
-    lhs.to(beGreaterThan(rhs))
-}
-
 public func > (lhs: Expectation<NMBComparable>, rhs: NMBComparable?) {
     lhs.to(beGreaterThan(rhs))
 }
+#endif
 
 #if canImport(Darwin)
 extension NMBObjCMatcher {

Sources/Nimble/Matchers/BeGreaterThanOrEqualTo.swift

@@ -13,6 +13,11 @@ public func beGreaterThanOrEqualTo<T: Comparable>(_ expectedValue: T?) -> Predic
     }
 }
 
+public func >=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
+    lhs.to(beGreaterThanOrEqualTo(rhs))
+}
+
+#if canImport(Darwin) || !compiler(>=5.1)
 /// A Nimble matcher that succeeds when the actual value is greater than
 /// or equal to the expected value.
 public func beGreaterThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -24,13 +29,10 @@ public func beGreaterThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Pre
     }
 }
 
-public func >=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
-    lhs.to(beGreaterThanOrEqualTo(rhs))
-}
-
 public func >=<T: NMBComparable>(lhs: Expectation<T>, rhs: T) {
     lhs.to(beGreaterThanOrEqualTo(rhs))
 }
+#endif
 
 #if canImport(Darwin)
 extension NMBObjCMatcher {

Sources/Nimble/Matchers/BeLessThan.swift

@@ -11,6 +11,11 @@ public func beLessThan<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
     }
 }
 
+public func <<T: Comparable>(lhs: Expectation<T>, rhs: T) {
+    lhs.to(beLessThan(rhs))
+}
+
+#if canImport(Darwin) || !compiler(>=5.1)
 /// A Nimble matcher that succeeds when the actual value is less than the expected value.
 public func beLessThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparable> {
     let message = "be less than <\(stringify(expectedValue))>"
@@ -21,13 +26,10 @@ public func beLessThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparab
     }
 }
 
-public func <<T: Comparable>(lhs: Expectation<T>, rhs: T) {
-    lhs.to(beLessThan(rhs))
-}
-
 public func < (lhs: Expectation<NMBComparable>, rhs: NMBComparable?) {
     lhs.to(beLessThan(rhs))
 }
+#endif
 
 #if canImport(Darwin)
 extension NMBObjCMatcher {

Sources/Nimble/Matchers/BeLessThanOrEqual.swift

@@ -11,6 +11,11 @@ public func beLessThanOrEqualTo<T: Comparable>(_ expectedValue: T?) -> Predicate
     }
 }
 
+public func <=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
+    lhs.to(beLessThanOrEqualTo(rhs))
+}
+
+#if canImport(Darwin) || !compiler(>=5.1)
 /// A Nimble matcher that succeeds when the actual value is less than
 /// or equal to the expected value.
 public func beLessThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -21,13 +26,10 @@ public func beLessThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predic
     }
 }
 
-public func <=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
-    lhs.to(beLessThanOrEqualTo(rhs))
-}
-
 public func <=<T: NMBComparable>(lhs: Expectation<T>, rhs: T) {
     lhs.to(beLessThanOrEqualTo(rhs))
 }
+#endif
 
 #if canImport(Darwin)
 extension NMBObjCMatcher {

Sources/Nimble/Matchers/MatcherProtocols.swift

@@ -136,13 +136,14 @@ extension NSDate: TestOutputStringConvertible {
 @objc public protocol NMBComparable {
     func NMB_compare(_ otherObject: NMBComparable!) -> ComparisonResult
 }
-#else
+#elseif !compiler(>=5.1)
 // This should become obsolete once Corelibs Foundation adds Comparable conformance to NSNumber
 public protocol NMBComparable {
     func NMB_compare(_ otherObject: NMBComparable!) -> ComparisonResult
 }
 #endif
 
+#if canImport(Darwin) || !compiler(>=5.1)
 extension NSNumber: NMBComparable {
     public func NMB_compare(_ otherObject: NMBComparable!) -> ComparisonResult {
         // swiftlint:disable:next force_cast
@@ -155,3 +156,4 @@ extension NSString: NMBComparable {
         return compare(otherObject as! String)
     }
 }
+#endif