Enable dip1000, drop support for < 2.085.1, test on OSX

.travis.yml

@@ -1,21 +1,35 @@
 language: d
 
+os:
+  - linux
+  - osx
+
+# Order: oldest DMD, newest LDC, oldest LDC
+# Latest DMD is in the matrix.include to give it the `COVERAGE` env variable
+d:
+  - dmd-2.085.1
+  - ldc-1.19.0
+  - ldc-1.15.0
+  - dmd-nightly
+  - ldc-latest-ci
+
 matrix:
   include:
-    - d: dmd-beta
-    - d: dmd-2.088.0
-      env: [COVERAGE=true]
+     # Last FE GDC is compatible with
     - d: dmd-2.076.1
-    - d: ldc-1.17.0
-    - d: ldc-1.16.0
-    - d: ldc-1.15.0
-    - d: ldc-1.14.0
-    - d: ldc-1.6.0
-    - d: dmd-2.087.1
-    - d: dmd-2.086.1
-    - d: dmd-2.085.1
-    - d: dmd-2.084.1
-
-sudo: false
+      os: linux
+      script: dub build
+    - d: dmd-2.076.1
+      os: osx
+      script: dub build
+    - d: dmd-2.090.0
+      os: linux
+      env: [COVERAGE=true]
+    - d: dmd-2.090.0
+      os: osx
+      env: [COVERAGE=true]
+  allow_failures:
+    - d: dmd-nightly
+    - d: ldc-latest-ci
 
 script: ./travis.sh

dub.sdl

@@ -3,3 +3,8 @@ description `A "tagged union" implementation with transparent operator forwardin
 authors "Sönke Ludwig"
 copyright "Copyright © 2015, Sönke Ludiwg"
 license "BSL-1.0"
+
+buildType "unittest" {
+    buildOptions "unittests" "debugMode" "debugInfo"
+    dflags "-preview=dip1000"
+}

source/taggedalgebraic/taggedalgebraic.d

@@ -943,7 +943,7 @@ unittest { // "in" operator
 unittest { // issue #15 - by-ref return values
 	static struct S {
 		int x;
-		ref int getx() { return x; }
+		ref int getx() return { return x; }
 	}
 	static union U { S s; }
 	alias TA = TaggedAlgebraic!U;