diff --git a/test/core/internal_names.fail.wast b/test/core/internal_names.fail.wast
deleted file mode 100644
index 1be1998b..00000000
--- a/test/core/internal_names.fail.wast
+++ /dev/null
@@ -1,11 +0,0 @@
-;; There's an anologous problem with thread names
-;; if we name a thread $_T1, etc.
-
-(module $_M1
-  (func (export "run")
-    (local i32)
-    (i32.const 1)
-    (local.set 0)
-  )
-)
-(invoke "run")
diff --git a/test/core/module_shadow.fail.wast b/test/core/module_shadow.fail.wast
deleted file mode 100644
index d5314f2f..00000000
--- a/test/core/module_shadow.fail.wast
+++ /dev/null
@@ -1,21 +0,0 @@
-(module $M1
-    (func (export "run") (result i32)
-        (local i32)
-        (i32.const 1)
-        (local.set 0)
-        (local.get 0)
-        (return)
-    )
-)
-
-(module $M1
-    (func (export "run") (result i32)
-        (local i32)
-        (i32.const 2)
-        (local.set 0)
-        (local.get 0)
-        (return)
-    )
-)
-
-(assert_return (invoke $M1 "run") (i32.const 2))
diff --git a/test/core/run.py b/test/core/run.py
index 5a5916df..2aa93b30 100755
--- a/test/core/run.py
+++ b/test/core/run.py
@@ -78,8 +78,6 @@ def _runTestFile(self, inputPath):
 
     # Run original file
     expectedExitCode = 1 if ".fail." in inputFile else 0
-    if expectedExitCode == 1:
-        print("### Expected exit 1; " + inputPath)
     logPath = self._auxFile(outputPath + ".log")
     self._runCommand(('%s "%s"') % (wasmCommand, inputPath), logPath, expectedExitCode)
 
diff --git a/test/core/threads/duplicate_thread_name.fail.wast b/test/core/threads/duplicate_thread_name.fail.wast
deleted file mode 100644
index 5ffe9549..00000000
--- a/test/core/threads/duplicate_thread_name.fail.wast
+++ /dev/null
@@ -1,42 +0,0 @@
-(module $Mem
-  (memory (export "shared") 1 1 shared)
-)
-(register "mem")
-
-(thread $T1 (shared (module $Mem))
-  (register "mem" $Mem)
-  (module
-    (memory (import "mem" "shared") 1 1 shared)
-    (func (export "run")
-      (i32.store (i32.const 0) (i32.const 42))
-    )
-  )
-  (invoke "run")
-)
-
-(thread $T2 (shared (module $Mem))
-  (register "mem" $Mem)
-  (module
-    (memory (import "mem" "shared") 1 1 shared)
-    (func (export "run") (result i32)
-      (i32.load (i32.const 0))
-    )
-  )
-
-  (thread $T1 (shared (module $Mem))
-    (register "mem" $Mem)
-    (module
-      (memory (import "mem" "shared") 1 1 shared)
-      (func (export "run_inner") (result i32)
-        (i32.load (i32.const 0))
-      )
-    )
-    (invoke "run_inner")
-  )
-
-  (wait $T1)
-)
-
-(wait $T1)
-(wait $T2)
-
diff --git a/test/core/threads/infinite_loop.fail.wast b/test/core/threads/infinite_loop.fail.wast
deleted file mode 100644
index bad5d50e..00000000
--- a/test/core/threads/infinite_loop.fail.wast
+++ /dev/null
@@ -1,32 +0,0 @@
-(module $Mem
-  (memory (export "shared") 1 1 shared)
-)
-(register "mem")
-
-(thread $Loop (shared (module $Mem))
-  (register "mem" $Mem)
-  (module
-    (memory (import "mem" "shared") 1 1 shared)
-    (func (export "run")
-      (loop $inf_loop
-        (i32.store (i32.const 5) (i32.const 42))
-        (br $inf_loop)
-      )
-    )
-  )
-  (invoke "run")
-)
-
-
-;; (wait $Loop)
-
-(module $Check
-  (memory (import "mem" "shared") 1 1 shared)
-
-  (func (export "check") (result i32)
-    (i32.load (i32.const 5))
-    (return)
-  )
-)
-
-(assert_return (invoke $Check "check") (i32.const 42))
diff --git a/test/core/threads/unlinkable.wast b/test/core/threads/unlinkable.wast
index 8bf74abe..880ed3d5 100644
--- a/test/core/threads/unlinkable.wast
+++ b/test/core/threads/unlinkable.wast
@@ -2,10 +2,6 @@
   (memory (export "shared") 1 1 shared)
 )
 
-;; (thread $T1
-;;   (module (memory (import "mem" "shared") 1 1 shared))
-;; )
-
 (thread $T2
   (assert_unlinkable
     (module (memory (import "mem" "shared") 1 1 shared))
@@ -13,13 +9,8 @@
   )
 )
 
-;; (wait $T1)
 (wait $T2)
 
-;; (thread $T3 (shared (module $Mem))
-;;   (module (memory (import "mem" "shared") 1 1 shared))
-;; )
-
 (thread $T4 (shared (module $Mem))
   (assert_unlinkable
     (module (memory (import "mem" "shared") 1 1 shared))
@@ -27,5 +18,4 @@
   )
 )
 
-;; (wait $T3)
 (wait $T4)