Synchronize libiberty sources with gcc mainline.

	* libiberty: Sync with gcc.  Bring in:
	2019-08-08  Martin Liska  <mliska@suse.cz>

	PR bootstrap/91352
	* lrealpath.c (is_valid_fd): New function.

	2019-07-24  Martin Liska  <mliska@suse.cz>

	PR lto/91228
	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Find first '\0' starting from gnu_lto + 1.

	2019-07-12  Ren Kimura  <rkx1209dev@gmail.com>

	* simple-object-elf.c (simple_object_elf_match): Check zero value shstrndx.
	This fixes a Bug 90924.

	2019-07-22  Martin Liska  <mliska@suse.cz>

	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Do not search for gnu_lto_v1, but search for first '\0'.

	2019-07-18  Eduard-Mihai Burtescu  <eddyb@lyken.rs>

	* cplus-dem.c: Include rust-demangle.h.
	* rust-demangle.c: Include rust-demangle.h.
	* rust-demangle.h: New file.

	2019-05-31  Michael Forney  <mforney@mforney.org>

	* cp-demangle.c: Don't define CP_DYNAMIC_ARRAYS if __STDC_NO_VLA__
	is non-zero.

	2019-04-30  Ben L  <bobsayshilol@live.co.uk>

	* d-demangle.c (dlang_parse_assocarray): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_tuple): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_structlit): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_arrayliteral): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_integer): Fix stack underflow.
	* testsuite/d-demangle-expected: Add testcase.

	* cp-demangle (d_print_comp_inner): Guard against a NULL 'typed_name'.
	* testsuite/demangle-expected: Add testcase.

	* cp-demangle.c (d_encoding): Guard against NULL return values from
	d_right (dc).
	* testsuite/demangle-expected: Add testcase.

	2019-04-29  Ben L  <bobsayshilol@live.co.uk>

	* cp-demangle.c (d_expression_1): Don't peek ahead unless the current
	char is valid.
	* testsuite/demangle-expected: Add testcase.

	2019-04-10  Nick Clifton  <nickc@redhat.com>

	PR 89394
	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
	lengths.
	(d_count_templates_scopes): Replace num_templates and num_scopes
	parameters with a struct d_print_info pointer parameter.  Adjust
	body of the function accordingly.  Add recursion counter and check
	that the recursion limit is not reached.
	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
	Reset recursion counter afterwards, unless the recursion limit was
	reached.

11 files changed, 301 insertions, 30 deletions

diff --git a/ChangeLog b/ChangeLog
index 52d97d5..1561555 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,81 @@
+2019-08-09  Nick Clifton  <nickc@redhat.com>
+
+	* libiberty: Sync with gcc.  Bring in:
+	2019-08-08  Martin Liska  <mliska@suse.cz>
+
+	PR bootstrap/91352
+	* lrealpath.c (is_valid_fd): New function.
+
+	2019-07-24  Martin Liska  <mliska@suse.cz>
+
+	PR lto/91228
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Find first '\0' starting from gnu_lto + 1.
+
+	2019-07-12  Ren Kimura  <rkx1209dev@gmail.com>
+
+	* simple-object-elf.c (simple_object_elf_match): Check zero value shstrndx.
+	This fixes a Bug 90924.
+
+	2019-07-22  Martin Liska  <mliska@suse.cz>
+
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Do not search for gnu_lto_v1, but search for first '\0'.
+
+	2019-07-18  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
+
+	* cplus-dem.c: Include rust-demangle.h.
+	* rust-demangle.c: Include rust-demangle.h.
+	* rust-demangle.h: New file.
+
+	2019-05-31  Michael Forney  <mforney@mforney.org>
+
+	* cp-demangle.c: Don't define CP_DYNAMIC_ARRAYS if __STDC_NO_VLA__
+	is non-zero.
+
+	2019-04-30  Ben L  <bobsayshilol@live.co.uk>
+
+	* d-demangle.c (dlang_parse_assocarray): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_tuple): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_structlit): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_arrayliteral): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_integer): Fix stack underflow.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* cp-demangle (d_print_comp_inner): Guard against a NULL 'typed_name'.
+	* testsuite/demangle-expected: Add testcase.
+
+	* cp-demangle.c (d_encoding): Guard against NULL return values from
+	d_right (dc).
+	* testsuite/demangle-expected: Add testcase.
+
+	2019-04-29  Ben L  <bobsayshilol@live.co.uk>
+
+	* cp-demangle.c (d_expression_1): Don't peek ahead unless the current
+	char is valid.
+	* testsuite/demangle-expected: Add testcase.
+
+	2019-04-10  Nick Clifton  <nickc@redhat.com>
+
+	PR 89394
+	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
+	lengths.
+	(d_count_templates_scopes): Replace num_templates and num_scopes
+	parameters with a struct d_print_info pointer parameter.  Adjust
+	body of the function accordingly.  Add recursion counter and check
+	that the recursion limit is not reached.
+	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
+	Reset recursion counter afterwards, unless the recursion limit was
+	reached.
+
 2019-07-13  Joel Brobecker  <brobecker@adacore.com>
 
 	* src-release (getver): If $tool/gdbsupport/create-version.sh
diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 031be3a..95cb152 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,78 @@
+2019-08-08  Martin Liska  <mliska@suse.cz>
+
+	PR bootstrap/91352
+	* lrealpath.c (is_valid_fd): New function.
+
+2019-07-24  Martin Liska  <mliska@suse.cz>
+
+	PR lto/91228
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Find first '\0' starting from gnu_lto + 1.
+
+2019-07-12  Ren Kimura  <rkx1209dev@gmail.com>
+
+	* simple-object-elf.c (simple_object_elf_match): Check zero value shstrndx.
+	This fixes a Bug 90924.
+
+2019-07-22  Martin Liska  <mliska@suse.cz>
+
+	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
+	Do not search for gnu_lto_v1, but search for first '\0'.
+
+2019-07-18  Eduard-Mihai Burtescu  <eddyb@lyken.rs>
+
+	* cplus-dem.c: Include rust-demangle.h.
+	* rust-demangle.c: Include rust-demangle.h.
+	* rust-demangle.h: New file.
+
+2019-05-31  Michael Forney  <mforney@mforney.org>
+
+	* cp-demangle.c: Don't define CP_DYNAMIC_ARRAYS if __STDC_NO_VLA__
+	is non-zero.
+
+2019-04-30  Ben L  <bobsayshilol@live.co.uk>
+
+	* d-demangle.c (dlang_parse_assocarray): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_tuple): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_structlit): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_arrayliteral): Correctly handle error result.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* d-demangle.c (dlang_parse_integer): Fix stack underflow.
+	* testsuite/d-demangle-expected: Add testcase.
+
+	* cp-demangle (d_print_comp_inner): Guard against a NULL 'typed_name'.
+	* testsuite/demangle-expected: Add testcase.
+
+	* cp-demangle.c (d_encoding): Guard against NULL return values from
+	d_right (dc).
+	* testsuite/demangle-expected: Add testcase.
+
+2019-04-29  Ben L  <bobsayshilol@live.co.uk>
+
+	* cp-demangle.c (d_expression_1): Don't peek ahead unless the current
+	char is valid.
+	* testsuite/demangle-expected: Add testcase.
+
+2019-04-10  Nick Clifton  <nickc@redhat.com>
+
+	PR 89394
+	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
+	lengths.
+	(d_count_templates_scopes): Replace num_templates and num_scopes
+	parameters with a struct d_print_info pointer parameter.  Adjust
+	body of the function accordingly.  Add recursion counter and check
+	that the recursion limit is not reached.
+	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
+	Reset recursion counter afterwards, unless the recursion limit was
+	reached.
+
 2019-04-07  Alan Modra  <amodra@gmail.com>
 
 	* functions.texi: Regenerate.
diff --git a/libiberty/cp-demangle.c b/libiberty/cp-demangle.c
index 779b4e7..aa78c86 100644
--- a/libiberty/cp-demangle.c
+++ b/libiberty/cp-demangle.c
@@ -192,9 +192,9 @@ static void d_init_info (const char *, int, size_t, struct d_info *);
 #else
 #ifdef __STDC__
 #ifdef __STDC_VERSION__
-#if __STDC_VERSION__ >= 199901L
+#if __STDC_VERSION__ >= 199901L && !__STDC_NO_VLA__
 #define CP_DYNAMIC_ARRAYS
-#endif /* __STDC__VERSION >= 199901L */
+#endif /* __STDC_VERSION__ >= 199901L && !__STDC_NO_VLA__ */
 #endif /* defined (__STDC_VERSION__) */
 #endif /* defined (__STDC__) */
 #endif /* ! defined (__GNUC__) */
@@ -1330,8 +1330,14 @@ d_encoding (struct d_info *di, int top_level)
 	     really apply here; this happens when parsing a class
 	     which is local to a function.  */
 	  if (dc->type == DEMANGLE_COMPONENT_LOCAL_NAME)
-	    while (is_fnqual_component_type (d_right (dc)->type))
-	      d_right (dc) = d_left (d_right (dc));
+	    {
+	      while (d_right (dc) != NULL
+		     && is_fnqual_component_type (d_right (dc)->type))
+		d_right (dc) = d_left (d_right (dc));
+
+	      if (d_right (dc) == NULL)
+		dc = NULL;
+	    }
 	}
       else
 	{
@@ -3359,7 +3365,7 @@ d_expression_1 (struct d_info *di)
       d_advance (di, 2);
       if (peek == 't')
 	type = cplus_demangle_type (di);
-      if (!d_peek_next_char (di))
+      if (!d_peek_char (di) || !d_peek_next_char (di))
 	return NULL;
       return d_make_comp (di, DEMANGLE_COMPONENT_INITIALIZER_LIST,
 			  type, d_exprlist (di, 'E'));
@@ -4761,12 +4767,8 @@ d_print_comp_inner (struct d_print_info *dpi, int options,
 	    typed_name = d_right (typed_name);
 	    if (typed_name->type == DEMANGLE_COMPONENT_DEFAULT_ARG)
 	      typed_name = typed_name->u.s_unary_num.sub;
-	    if (typed_name == NULL)
-	      {
-		d_print_error (dpi);
-		return;
-	      }
-	    while (is_fnqual_component_type (typed_name->type))
+	    while (typed_name != NULL
+		   && is_fnqual_component_type (typed_name->type))
 	      {
 		if (i >= sizeof adpm / sizeof adpm[0])
 		  {
@@ -4785,6 +4787,11 @@ d_print_comp_inner (struct d_print_info *dpi, int options,
 
 		typed_name = d_left (typed_name);
 	      }
+	    if (typed_name == NULL)
+	      {
+		d_print_error (dpi);
+		return;
+	      }
 	  }
 
 	/* If typed_name is a template, then it applies to the
diff --git a/libiberty/cplus-dem.c b/libiberty/cplus-dem.c
index afceed2..a39e2bf 100644
--- a/libiberty/cplus-dem.c
+++ b/libiberty/cplus-dem.c
@@ -52,6 +52,7 @@ void * realloc ();
 #define CURRENT_DEMANGLING_STYLE options
 
 #include "libiberty.h"
+#include "rust-demangle.h"
 
 enum demangling_styles current_demangling_style = auto_demangling;
 
diff --git a/libiberty/d-demangle.c b/libiberty/d-demangle.c
index 8acbf04..becc402 100644
--- a/libiberty/d-demangle.c
+++ b/libiberty/d-demangle.c
@@ -939,8 +939,8 @@ dlang_parse_integer (string *decl, const char *mangled, char type)
   if (type == 'a' || type == 'u' || type == 'w')
     {
       /* Parse character value.  */
-      char value[10];
-      int pos = 10;
+      char value[20];
+      int pos = sizeof(value);
       int width = 0;
       long val;
 
@@ -991,7 +991,7 @@ dlang_parse_integer (string *decl, const char *mangled, char type)
 	  for (; width > 0; width--)
 	    value[--pos] = '0';
 
-	  string_appendn (decl, &(value[pos]), 10 - pos);
+	  string_appendn (decl, &(value[pos]), sizeof(value) - pos);
 	}
       string_append (decl, "'");
     }
@@ -1191,6 +1191,9 @@ dlang_parse_arrayliteral (string *decl, const char *mangled)
   while (elements--)
     {
       mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (mangled == NULL)
+	return NULL;
+
       if (elements != 0)
 	string_append (decl, ", ");
     }
@@ -1214,8 +1217,13 @@ dlang_parse_assocarray (string *decl, const char *mangled)
   while (elements--)
     {
       mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (mangled == NULL)
+	return NULL;
+
       string_append (decl, ":");
       mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (mangled == NULL)
+	return NULL;
 
       if (elements != 0)
 	string_append (decl, ", ");
@@ -1243,6 +1251,9 @@ dlang_parse_structlit (string *decl, const char *mangled, const char *name)
   while (args--)
     {
       mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (mangled == NULL)
+	return NULL;
+
       if (args != 0)
 	string_append (decl, ", ");
     }
@@ -1497,6 +1508,9 @@ dlang_parse_tuple (string *decl, const char *mangled)
   while (elements--)
     {
       mangled = dlang_type (decl, mangled);
+      if (mangled == NULL)
+	return NULL;
+
       if (elements != 0)
 	string_append (decl, ", ");
     }
diff --git a/libiberty/lrealpath.c b/libiberty/lrealpath.c
index 7f66dc2..ac914a7 100644
--- a/libiberty/lrealpath.c
+++ b/libiberty/lrealpath.c
@@ -49,6 +49,9 @@ components will be simplified.  The returned value will be allocated using
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
 
 /* On GNU libc systems the declaration is only visible with _GNU_SOURCE.  */
 #if defined(HAVE_CANONICALIZE_FILE_NAME) \
@@ -155,3 +158,16 @@ lrealpath (const char *filename)
   /* This system is a lost cause, just duplicate the filename.  */
   return strdup (filename);
 }
+
+/* Return true when FD file descriptor exists.  */
+
+int
+is_valid_fd (int fd)
+{
+#if defined(_WIN32)
+  HANDLE h = (HANDLE) _get_osfhandle (fd);
+  return h != (HANDLE) -1;
+#else
+  return fcntl (fd, F_GETFD) >= 0;
+#endif
+}
diff --git a/libiberty/rust-demangle.c b/libiberty/rust-demangle.c
index 9b2d2db..2302db4 100644
--- a/libiberty/rust-demangle.c
+++ b/libiberty/rust-demangle.c
@@ -47,6 +47,7 @@ extern void *memset(void *s, int c, size_t n);
 
 #include <demangle.h>
 #include "libiberty.h"
+#include "rust-demangle.h"
 
 
 /* Mangled Rust symbols look like this:
diff --git a/libiberty/rust-demangle.h b/libiberty/rust-demangle.h
new file mode 100644
index 0000000..abf4c6c
--- /dev/null
+++ b/libiberty/rust-demangle.h
@@ -0,0 +1,45 @@
+/* Internal demangler interface for the Rust programming language.
+   Copyright (C) 2016-2019 Free Software Foundation, Inc.
+   Written by David Tolnay (dtolnay@gmail.com).
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+In addition to the permissions in the GNU Library General Public
+License, the Free Software Foundation gives you unlimited permission
+to link the compiled version of this file into combinations with other
+programs, and to distribute those combinations without any restriction
+coming from the use of this file.  (The Library Public License
+restrictions do apply in other respects; for example, they cover
+modification of the file, and distribution when not linked into a
+combined executable.)
+
+Libiberty is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.
+If not, see <http://www.gnu.org/licenses/>.  */
+
+/* This file provides some definitions shared by cplus-dem.c and
+   rust-demangle.c.  It should not be included by any other files.  */
+
+/* Returns non-zero iff MANGLED is a rust mangled symbol.  MANGLED must
+   already have been demangled through cplus_demangle_v3.  If this function
+   returns non-zero then MANGLED can be demangled (in-place) using
+   RUST_DEMANGLE_SYM.  */
+extern int
+rust_is_mangled (const char *mangled);
+
+/* Demangles SYM (in-place) if RUST_IS_MANGLED returned non-zero for SYM.
+   If RUST_IS_MANGLED returned zero for SYM then RUST_DEMANGLE_SYM might
+   replace characters that cannot be demangled with '?' and might truncate
+   SYM.  After calling RUST_DEMANGLE_SYM SYM might be shorter, but never
+   larger.  */
+extern void
+rust_demangle_sym (char *sym);
diff --git a/libiberty/simple-object-elf.c b/libiberty/simple-object-elf.c
index 22c9ae7..7515926 100644
--- a/libiberty/simple-object-elf.c
+++ b/libiberty/simple-object-elf.c
@@ -548,7 +548,15 @@ simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
       XDELETE (eor);
       return NULL;
     }
-
+  
+  if (eor->shstrndx == 0)
+    {
+      *errmsg = "invalid ELF shstrndx == 0";
+      *err = 0;
+      XDELETE (eor);
+      return NULL;
+    }
+  
   return (void *) eor;
 }
 
@@ -1358,9 +1366,8 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	  return errmsg;
 	}
 
-      /* If we are processing .symtab purge __gnu_lto_v1 and
-	 __gnu_lto_slim symbols from it and any symbols in discarded
-	 sections.  */
+      /* If we are processing .symtab purge __gnu_lto_slim symbol
+	 from it and any symbols in discarded sections.  */
       if (sh_type == SHT_SYMTAB)
 	{
 	  unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
@@ -1380,14 +1387,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 				       sobj->offset + stroff,
 				       (unsigned char *)strings,
 				       strsz, &errmsg, err);
-	  /* Find gnu_lto_ in strings.  */
-	  while ((gnu_lto = (char *) memchr (gnu_lto, 'g',
-					     strings + strsz - gnu_lto)))
-	    if (strncmp (gnu_lto, "gnu_lto_v1",
-			 strings + strsz - gnu_lto) == 0)
-	      break;
-	    else
-	      gnu_lto++;
+	  /* Find first '\0' in strings.  */
+	  gnu_lto = (char *) memchr (gnu_lto + 1, '\0',
+				     strings + strsz - gnu_lto);
 	  /* Read the section index table if present.  */
 	  if (symtab_indices_shndx[i - 1] != 0)
 	    {
@@ -1461,10 +1463,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 			 undefined and sharing the gnu_lto_ name.  */
 		      bind = STB_WEAK;
 		      other = STV_HIDDEN;
-		      if (gnu_lto)
-			ELF_SET_FIELD (type_functions, ei_class, Sym,
-				       ent, st_name, Elf_Word,
-				       gnu_lto - strings);
+		      ELF_SET_FIELD (type_functions, ei_class, Sym,
+				     ent, st_name, Elf_Word,
+				     gnu_lto - strings);
 		      ELF_SET_FIELD (type_functions, ei_class, Sym,
 				     ent, st_shndx, Elf_Half, SHN_UNDEF);
 		    }
diff --git a/libiberty/testsuite/d-demangle-expected b/libiberty/testsuite/d-demangle-expected
index 547a2dd..490d4e1 100644
--- a/libiberty/testsuite/d-demangle-expected
+++ b/libiberty/testsuite/d-demangle-expected
@@ -1306,3 +1306,23 @@ rt.lifetime._d_newarrayOpT!(_d_newarrayiT)._d_newarrayOpT(const(TypeInfo), ulong
 --format=dlang
 _D4core8demangle16__T6mangleTFZPvZ6mangleFNaNbNfAxaAaZ11DotSplitter5emptyMxFNaNbNdNiNfZb
 core.demangle.mangle!(void*() function).mangle(const(char)[], char[]).DotSplitter.empty() const
+# Could crash
+--format=dlang
+_D8__T2fnVa8888888888888_
+_D8__T2fnVa8888888888888_
+# Could crash
+--format=dlang
+_D5__T2fnVmA1A1A911111111D
+_D5__T2fnVmA1A1A911111111D
+# Could crash
+--format=dlang
+_D7__T2fnVlS8S588888888888S6S5
+_D7__T2fnVlS8S588888888888S6S5
+# Could crash
+--format=dlang
+_D1_B699999999961*
+_D1_B699999999961*
+# Could crash
+--format=dlang
+_D5__T1fVHacA6666666666_
+_D5__T1fVHacA6666666666_
diff --git a/libiberty/testsuite/demangle-expected b/libiberty/testsuite/demangle-expected
index 3723b7a..f21ed00 100644
--- a/libiberty/testsuite/demangle-expected
+++ b/libiberty/testsuite/demangle-expected
@@ -68,6 +68,19 @@ _$_H1R
 
 _Q8ccQ4M2e.
 _Q8ccQ4M2e.
+# Could crash
+
+_ZmmAtl
+_ZmmAtl
+# Could crash
+--no-params
+_ZZaSFvOEES_
+_ZZaSFvOEES_
+_ZZaSFvOEES_
+# Could crash
+
+_ZZeqFvOEES_z
+_ZZeqFvOEES_z
 #
 # demangler/80513 Test for bogus characters after __thunk_