remove the obsolete testsuite/srg directory

testsuite/srg/cyclic-direct/cyclic-direct.gf

@@ -1,7 +0,0 @@
-cat S;
-
-fun f : S -> S ;
-fun g : S ;
-
-lin f s = { s = s.s } ;
-lin g = { s = "g" } ;

testsuite/srg/cyclic-empty-prod/cyclic-empty-prod.gf

@@ -1,9 +0,0 @@
-cat S; E; 
-
-fun s : S ;
-fun es : E -> S -> S ;
-fun e : E ;
-
-lin s  = { s = "s" } ;
-lin es e s = { s = e.s ++ s.s } ;
-lin e = { s = [] } ;

testsuite/srg/cyclic-indirect/cyclic-indirect.gf

@@ -1,11 +0,0 @@
--- a grammar with an indirect cycle
-
-cat S; G;
-
-fun f : S ;
-fun fg : G -> S ;
-fun gf : S -> G ;
-
-lin f  = { s = "f" } ;
-lin fg x = x;
-lin gf x = x;

testsuite/srg/lc_lr-empty-category/lc_lr-empty-category.gf

@@ -1,9 +0,0 @@
-cat S; E; 
-
-fun f : E -> S ;
-fun g : S -> S ;
-fun e : E ;
-
-lin f e = { s = e.s } ;
-lin g s = { s = s.s ++ "x" } ;
-lin e = { s = "e" } ;

testsuite/srg/left-recursive/left-recursive.gf

@@ -1,7 +0,0 @@
-cat S;
-
-fun f : S -> S ; 
-    g : S ;
-
-lin f x = { s = x.s ++ "f" } ;
-    g = { s = "s" } ;

testsuite/srg/variants-ebnf/variants-ebnf.gf

@@ -1,4 +0,0 @@
-cat S;
-fun f : S;
-
-lin f = { s = variants {"a"; "b"} ++ variants {"c"; "d"} ++ variants {"e"; "f"} ++ variants { "g";"h";} } ;