Fix compilation errors of lambda valid tests

valid/function/lambdas/callLambdaInALoop.wacc

 # Call lambdas repetitively 
-
+#
 # Output:
 # 0
 # 1
 # 2
 # 3
 # 4
-
+#
 # Program:
 
 begin
-    int n = 5
+    int n = 5 ;
     int i = 0 ;
     while i < n do
-      println call (\() -> i)() ;
-      i = i + 1;
-    done ;
+      int r = call (\(int i) -> i)(i) ;
+      println r ;
+      i = i + 1
+    done
 end

valid/function/lambdas/lambdaInsideFunction.wacc

@@ -6,8 +6,9 @@
 # Program:
 begin
   int f(int x, int y) is
-    return call (\(int x, int y) -> x * y)(x,y)
+    int r = call (\(int x, int y) -> x * y)(x,y);
+    return r
   end
-  int y = f(2,3)
+  int y = call f(2,3);
   print y
 end
\ No newline at end of file

valid/function/lambdas/lambdaWithManyArgs.wacc

@@ -6,5 +6,6 @@
 # Program:
 
 begin
-    print call (\(int x, int y, bool z, bool a, bool b, string c) -> x + y)(2, 3, false, false, true, "hello")
+    int r = call (\(int x, int y, bool z, bool a, bool b, string c) -> x + y)(2, 3, false, false, true, "hello");
+    print r
 end
\ No newline at end of file