diff --git a/testsuite/lpgf/README.md b/testsuite/lpgf/README.md
index aeadcad3d..a850751d8 100644
--- a/testsuite/lpgf/README.md
+++ b/testsuite/lpgf/README.md
@@ -104,11 +104,17 @@ Max memory: 328.20 MB
 - size: 3.01 MB  Phrasebook.lpgf
 Max memory: 1.33 GB
 
-**Baseline LPGF String**
+**Baseline LPGF String instead of Text**
 - compile: 12.124689s
 - size: 3.01 MB  Phrasebook.lpgf
 Max memory: 1.34 GB
 
+**Baseline LPGF with impossible pruning**
+- compile: 7.406503s
+- size: 3.01 MB  Phrasebook.lpgf
+Max memory: 1.13 GB
+
+
 **B -extractStrings**
 - compile: 13.822735s
 - size: 5.78 MB  Phrasebook.lpgf
diff --git a/testsuite/lpgf/mkTreebank.sh b/testsuite/lpgf/mkTreebank.sh
index 38508f894..663f46e2f 100755
--- a/testsuite/lpgf/mkTreebank.sh
+++ b/testsuite/lpgf/mkTreebank.sh
@@ -21,7 +21,7 @@ done < $TREES
 
 echo "Writing $TREEBANK"
 : > $TREEBANK
-gf --crun $ABSNAME.pgf < "$SCRIPT" > /dev/null
+gf --crun "$ABSNAME.pgf" < "$SCRIPT" > /dev/null
 
 echo "Removing $SCRIPT"
 rm "$SCRIPT"
diff --git a/testsuite/lpgf/unittests/Literals.gf b/testsuite/lpgf/unittests/Literals.gf
new file mode 100644
index 000000000..6740a4b0e
--- /dev/null
+++ b/testsuite/lpgf/unittests/Literals.gf
@@ -0,0 +1,7 @@
+abstract Literals = {
+  cat S ;
+  fun
+    mkString : String -> S ;
+    mkInt : Int -> S ;
+    mkFloat : Float -> S ;
+}
diff --git a/testsuite/lpgf/unittests/Literals.treebank b/testsuite/lpgf/unittests/Literals.treebank
new file mode 100644
index 000000000..6d7120082
--- /dev/null
+++ b/testsuite/lpgf/unittests/Literals.treebank
@@ -0,0 +1,9 @@
+Literals: mkString "hello"
+LiteralsCnc: hello
+
+Literals: mkInt 123
+LiteralsCnc: 123
+
+Literals: mkFloat 30.809000
+LiteralsCnc: 30.809000
+
diff --git a/testsuite/lpgf/unittests/Literals.trees b/testsuite/lpgf/unittests/Literals.trees
new file mode 100644
index 000000000..0a727e63a
--- /dev/null
+++ b/testsuite/lpgf/unittests/Literals.trees
@@ -0,0 +1,3 @@
+mkString "hello"
+mkInt 123
+mkFloat 30.809
diff --git a/testsuite/lpgf/unittests/LiteralsCnc.gf b/testsuite/lpgf/unittests/LiteralsCnc.gf
new file mode 100644
index 000000000..a6e1ceef1
--- /dev/null
+++ b/testsuite/lpgf/unittests/LiteralsCnc.gf
@@ -0,0 +1,7 @@
+concrete LiteralsCnc of Literals = open Prelude in {
+  lincat S = SS ;
+  lin
+    mkString s = s ;
+    mkInt s = s ;
+    mkFloat s = s ;
+}