diff --git a/regression/cbmc/builtin_is/test.desc b/regression/cbmc/builtin_is/test.desc
deleted file mode 100644
index 2b79617eedb..00000000000
--- a/regression/cbmc/builtin_is/test.desc
+++ /dev/null
@@ -1,7 +0,0 @@
-KNOWNBUG
-main.c
-
-^EXIT=6$
-^SIGNAL=0$
-expected to have two float/double arguments
---
diff --git a/regression/cbmc/builtin_va_copy_lvalue/test.desc b/regression/cbmc/builtin_va_copy_lvalue/test.desc
deleted file mode 100644
index 27e7c0c6e96..00000000000
--- a/regression/cbmc/builtin_va_copy_lvalue/test.desc
+++ /dev/null
@@ -1,7 +0,0 @@
-KNOWNBUG
-main.c
-
-^EXIT=6$
-^SIGNAL=0$
-argument expected to be lvalue
---
diff --git a/regression/cbmc/builtin_va_end_lvalue/test.desc b/regression/cbmc/builtin_va_end_lvalue/test.desc
deleted file mode 100644
index 27e7c0c6e96..00000000000
--- a/regression/cbmc/builtin_va_end_lvalue/test.desc
+++ /dev/null
@@ -1,7 +0,0 @@
-KNOWNBUG
-main.c
-
-^EXIT=6$
-^SIGNAL=0$
-argument expected to be lvalue
---
diff --git a/regression/cbmc/builtin_va_start_lvalue/test.desc b/regression/cbmc/builtin_va_start_lvalue/test.desc
deleted file mode 100644
index 27e7c0c6e96..00000000000
--- a/regression/cbmc/builtin_va_start_lvalue/test.desc
+++ /dev/null
@@ -1,7 +0,0 @@
-KNOWNBUG
-main.c
-
-^EXIT=6$
-^SIGNAL=0$
-argument expected to be lvalue
---
diff --git a/regression/cbmc/builtin_va_start_two/test.desc b/regression/cbmc/builtin_va_start_two/test.desc
deleted file mode 100644
index adaf8a6ccf2..00000000000
--- a/regression/cbmc/builtin_va_start_two/test.desc
+++ /dev/null
@@ -1,7 +0,0 @@
-KNOWNBUG
-main.c
-
-^EXIT=6$
-^SIGNAL=0$
-expected to have two arguments
---
diff --git a/regression/cbmc/builtin_is/main.c b/regression/goto-gcc/builtin_is/main.c
similarity index 100%
rename from regression/cbmc/builtin_is/main.c
rename to regression/goto-gcc/builtin_is/main.c
diff --git a/regression/goto-gcc/builtin_is/test.desc b/regression/goto-gcc/builtin_is/test.desc
new file mode 100644
index 00000000000..ba0487fd27f
--- /dev/null
+++ b/regression/goto-gcc/builtin_is/test.desc
@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=1$
+^SIGNAL=0$
+expected to have two float/double arguments
+--
+--
+The C front-end should catch the problem during type checking, and not leave it
+to goto-program conversion to detect the problem.
diff --git a/regression/cbmc/builtin_va_copy_lvalue/main.c b/regression/goto-gcc/builtin_va_copy_lvalue/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_copy_lvalue/main.c
rename to regression/goto-gcc/builtin_va_copy_lvalue/main.c
diff --git a/regression/goto-gcc/builtin_va_copy_lvalue/test.desc b/regression/goto-gcc/builtin_va_copy_lvalue/test.desc
new file mode 100644
index 00000000000..413f198cf36
--- /dev/null
+++ b/regression/goto-gcc/builtin_va_copy_lvalue/test.desc
@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=1$
+^SIGNAL=0$
+argument expected to be lvalue
+--
+--
+The C front-end should catch the problem during type checking, and not leave it
+to goto-program conversion to detect the problem.
diff --git a/regression/cbmc/builtin_va_copy_two/main.c b/regression/goto-gcc/builtin_va_copy_two/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_copy_two/main.c
rename to regression/goto-gcc/builtin_va_copy_two/main.c
diff --git a/regression/cbmc/builtin_va_end_one/test.desc b/regression/goto-gcc/builtin_va_copy_two/test.desc
similarity index 87%
rename from regression/cbmc/builtin_va_end_one/test.desc
rename to regression/goto-gcc/builtin_va_copy_two/test.desc
index bca33a5dd6d..656aeffa3b3 100644
--- a/regression/cbmc/builtin_va_end_one/test.desc
+++ b/regression/goto-gcc/builtin_va_copy_two/test.desc
@@ -1,7 +1,7 @@
 CORE
 main.c
 
-^EXIT=6$
+^EXIT=1$
 ^SIGNAL=0$
 wrong number of function arguments
 --
diff --git a/regression/cbmc/builtin_va_end_lvalue/main.c b/regression/goto-gcc/builtin_va_end_lvalue/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_end_lvalue/main.c
rename to regression/goto-gcc/builtin_va_end_lvalue/main.c
diff --git a/regression/goto-gcc/builtin_va_end_lvalue/test.desc b/regression/goto-gcc/builtin_va_end_lvalue/test.desc
new file mode 100644
index 00000000000..413f198cf36
--- /dev/null
+++ b/regression/goto-gcc/builtin_va_end_lvalue/test.desc
@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=1$
+^SIGNAL=0$
+argument expected to be lvalue
+--
+--
+The C front-end should catch the problem during type checking, and not leave it
+to goto-program conversion to detect the problem.
diff --git a/regression/cbmc/builtin_va_end_one/main.c b/regression/goto-gcc/builtin_va_end_one/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_end_one/main.c
rename to regression/goto-gcc/builtin_va_end_one/main.c
diff --git a/regression/cbmc/builtin_va_copy_two/test.desc b/regression/goto-gcc/builtin_va_end_one/test.desc
similarity index 87%
rename from regression/cbmc/builtin_va_copy_two/test.desc
rename to regression/goto-gcc/builtin_va_end_one/test.desc
index bca33a5dd6d..656aeffa3b3 100644
--- a/regression/cbmc/builtin_va_copy_two/test.desc
+++ b/regression/goto-gcc/builtin_va_end_one/test.desc
@@ -1,7 +1,7 @@
 CORE
 main.c
 
-^EXIT=6$
+^EXIT=1$
 ^SIGNAL=0$
 wrong number of function arguments
 --
diff --git a/regression/cbmc/builtin_va_start_lvalue/main.c b/regression/goto-gcc/builtin_va_start_lvalue/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_start_lvalue/main.c
rename to regression/goto-gcc/builtin_va_start_lvalue/main.c
diff --git a/regression/goto-gcc/builtin_va_start_lvalue/test.desc b/regression/goto-gcc/builtin_va_start_lvalue/test.desc
new file mode 100644
index 00000000000..413f198cf36
--- /dev/null
+++ b/regression/goto-gcc/builtin_va_start_lvalue/test.desc
@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=1$
+^SIGNAL=0$
+argument expected to be lvalue
+--
+--
+The C front-end should catch the problem during type checking, and not leave it
+to goto-program conversion to detect the problem.
diff --git a/regression/cbmc/builtin_va_start_two/main.c b/regression/goto-gcc/builtin_va_start_two/main.c
similarity index 100%
rename from regression/cbmc/builtin_va_start_two/main.c
rename to regression/goto-gcc/builtin_va_start_two/main.c
diff --git a/regression/goto-gcc/builtin_va_start_two/test.desc b/regression/goto-gcc/builtin_va_start_two/test.desc
new file mode 100644
index 00000000000..b1d2dbc1ab3
--- /dev/null
+++ b/regression/goto-gcc/builtin_va_start_two/test.desc
@@ -0,0 +1,10 @@
+KNOWNBUG
+main.c
+
+^EXIT=1$
+^SIGNAL=0$
+expected to have two arguments
+--
+--
+The C front-end should catch the problem during type checking, and not leave it
+to goto-program conversion to detect the problem.