diff --git a/tests/c/debuginfo.old.c b/tests/c/debuginfo.old.c
deleted file mode 100644
index 5b8b6c704..000000000
--- a/tests/c/debuginfo.old.c
+++ /dev/null
@@ -1,35 +0,0 @@
-// ignore-if: test $YK_CARGO_PROFILE != "debug"
-// Run-time:
-//   env-var: YKD_LOG_IR=-:jit-pre-opt
-//   env-var: YKD_SERIALISE_COMPILATION=1
-//   stderr:
-//     ...
-//     define ptr @__yk_compiled_trace_0(...
-//     entry:
-//       ; main() c/debuginfo.c:28:5
-//       ...
-
-// Check that debug information is included in module prints.
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <yk.h>
-#include <yk_testing.h>
-
-int main(int argc, char **argv) {
-  YkMT *mt = yk_mt_new(NULL);
-  yk_mt_hot_threshold_set(mt, 0);
-  YkLocation loc = yk_location_new();
-
-  int i = 4;
-  NOOPT_VAL(i);
-  while (i > 0) {
-    yk_mt_control_point(mt, &loc);
-    i--;
-  }
-
-  yk_location_drop(loc);
-  yk_mt_drop(mt);
-  return (EXIT_SUCCESS);
-}
diff --git a/tests/c/direct_recursion.old.c b/tests/c/direct_recursion.old.c
deleted file mode 100644
index ad2b130e7..000000000
--- a/tests/c/direct_recursion.old.c
+++ /dev/null
@@ -1,54 +0,0 @@
-// Run-time:
-//   env-var: YKD_LOG_IR=-:jit-pre-opt
-//   env-var: YKD_SERIALISE_COMPILATION=1
-//   env-var: YKD_LOG_JITSTATE=-
-//   stderr:
-//     jitstate: start-tracing
-//     4:0
-//     jitstate: stop-tracing
-//     --- Begin jit-pre-opt ---
-//     ...
-//     ...call i32 @f(...
-//     ...
-//     --- End jit-pre-opt ---
-//     3:0
-//     jitstate: enter-jit-code
-//     2:0
-//     1:0
-//     jitstate: deoptimise
-//     ...
-
-// Check that recursive function calls are not unrolled.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <yk.h>
-#include <yk_testing.h>
-
-__attribute__((noinline)) int f(int num) {
-  NOOPT_VAL(num);
-  if (num == 0)
-    return 0;
-  else
-    return f(num - 1);
-}
-
-int main(int argc, char **argv) {
-  YkMT *mt = yk_mt_new(NULL);
-  yk_mt_hot_threshold_set(mt, 0);
-  YkLocation loc = yk_location_new();
-
-  int i = 4;
-  NOOPT_VAL(i);
-  while (i > 0) {
-    yk_mt_control_point(mt, &loc);
-    int x = 3;
-    NOOPT_VAL(x);
-    fprintf(stderr, "%d:%d\n", i, f(x));
-    i--;
-  }
-
-  yk_location_drop(loc);
-  yk_mt_drop(mt);
-  return (EXIT_SUCCESS);
-}
diff --git a/tests/c/inline_asm_call.old.c b/tests/c/inline_asm_call.old.c
deleted file mode 100644
index 95260fe67..000000000
--- a/tests/c/inline_asm_call.old.c
+++ /dev/null
@@ -1,50 +0,0 @@
-// Run-time:
-//   env-var: YKD_SERIALISE_COMPILATION=1
-//   status: error
-//   stderr:
-//     ...
-//     InlineAsm is currently not supported.
-
-// Check that we bail when we see non-empty inline asm.
-
-#include <assert.h>
-#include <stdlib.h>
-#include <yk.h>
-#include <yk_testing.h>
-
-int foo() {
-  fprintf(stderr, "foo\n");
-  return 11;
-}
-
-int main(int argc, char **argv) {
-
-  YkMT *mt = yk_mt_new(NULL);
-  yk_mt_hot_threshold_set(mt, 0);
-  YkLocation loc = yk_location_new();
-
-  int res = 0;
-  int i = 4;
-  NOOPT_VAL(i);
-  NOOPT_VAL(res);
-  while (i > 0) {
-    yk_mt_control_point(mt, &loc);
-#ifdef __x86_64__
-    // Stores the constant 5 into `res`.
-    asm("call foo"
-        : "=r"(res) // outputs.
-        :           // inputs.
-        :           // clobbers.
-    );
-    fprintf(stderr, "res=%d\n", res);
-#else
-#error unknown platform
-#endif
-    i--;
-  }
-
-  assert(res == 5);
-  yk_location_drop(loc);
-  yk_mt_drop(mt);
-  return (EXIT_SUCCESS);
-}
diff --git a/tests/c/mutual_recursion.old.c b/tests/c/mutual_recursion.old.c
deleted file mode 100644
index 4cd871800..000000000
--- a/tests/c/mutual_recursion.old.c
+++ /dev/null
@@ -1,74 +0,0 @@
-// Run-time:
-//   env-var: YKD_LOG_IR=-:jit-pre-opt,aot
-//   env-var: YKD_SERIALISE_COMPILATION=1
-//   env-var: YKD_LOG_JITSTATE=-
-//   stderr:
-//     ...
-//     --- Begin aot ---
-//     ...
-//     define dso_local void @g(...
-//     ...
-//     define dso_local void @f(...
-//     ...
-//     --- End aot ---
-//     --- Begin jit-pre-opt ---
-//     ...
-//     call void @f(...
-//     ...
-//     --- End jit-pre-opt ---
-//     ...
-//     jitstate: enter-jit-code
-//     f: 3
-//     g: 3
-//     f: 2
-//     g: 2
-//     f: 1
-//     g: 1
-//     f: 0
-//     ...
-
-// Check that mutual recusrion works.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <yk.h>
-#include <yk_testing.h>
-
-void f(int);
-void g(int);
-
-__attribute__((noinline)) void g(int num) {
-  NOOPT_VAL(num);
-  fprintf(stderr, "g: %d\n", num);
-  num--;
-  f(num);
-}
-
-__attribute__((noinline)) void f(int num) {
-  NOOPT_VAL(num);
-  fprintf(stderr, "f: %d\n", num);
-  if (num == 0)
-    return;
-
-  g(num);
-}
-
-int main(int argc, char **argv) {
-  YkMT *mt = yk_mt_new(NULL);
-  yk_mt_hot_threshold_set(mt, 0);
-  YkLocation loc = yk_location_new();
-
-  int i = 4;
-  NOOPT_VAL(i);
-  while (i > 0) {
-    yk_mt_control_point(mt, &loc);
-    int x = 3;
-    NOOPT_VAL(x);
-    f(x);
-    i--;
-  }
-
-  yk_location_drop(loc);
-  yk_mt_drop(mt);
-  return (EXIT_SUCCESS);
-}