Add a test for inferred rules

test/jbuild

@@ -13,9 +13,9 @@
 
 (alias
  ((name runtest)
-  (deps ((files_recursively_in workspaces/globs)))
+  (deps ((files_recursively_in workspaces/misc)))
   (action
-   (chdir workspaces/globs
+   (chdir workspaces/misc
     (run ${exe:run.exe} -- ${bin:jbuilder} runtest -j1 --root .)))))
 
 (alias

test/workspaces/misc/jbuild

@@ -1,4 +1,5 @@
 ;; Test for ${^} with globs in rules
+
 (rule
  ((targets (result expected))
   (deps    (jbuild (glob_files *.txt)))
@@ -22,3 +23,12 @@
  ((name   runtest)
   (deps   (result2 expected2))
   (action (run diff -u result2 expected2))))
+
+;; Test inferred rules
+
+(rule (copy jbuild jbuild-plop))
+
+(alias
+ ((name   runtest)
+  (deps   (jbuild jbuild-plop))
+  (action (run diff -u ${!^}))))