[Bug rust/26197] rust FAILs with rustc 1.36.0 and llvm 7

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26197

--- Comment #23 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #22)
> Please try this.  I can't test it myself.
> 
> diff --git a/gdb/testsuite/gdb.rust/simple.exp
> b/gdb/testsuite/gdb.rust/simple.exp
> index f0cad4e7634..f057d2a071a 100644
> --- a/gdb/testsuite/gdb.rust/simple.exp
> +++ b/gdb/testsuite/gdb.rust/simple.exp
> @@ -239,7 +239,8 @@ gdb_test "print .." " = .*::ops::RangeFull"
>  
>  set pass_pattern \
>      " =
> core::option::Option<\[a-z\]+::string::String>::Some\\(\[a-z\]+::string::
> String .*"
> -set xfail_pattern " = <error reading variable>"
> +set xfail_pattern \
> +    " = (<error reading variable>|That operation is not available on .*)"
>  gdb_test_multiple "print str_some" "" {
>      -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
>         pass $gdb_test_name
> 
> 
> Also available on my github, branch submit/pr-26197-xfails

With this additional change:
...
diff --git a/gdb/testsuite/gdb.rust/simple.exp
b/gdb/testsuite/gdb.rust/simple.exp
index f057d2a071..b32eaf1e4d 100644
--- a/gdb/testsuite/gdb.rust/simple.exp
+++ b/gdb/testsuite/gdb.rust/simple.exp
@@ -240,7 +240,7 @@ gdb_test "print .." " = .*::ops::RangeFull"
 set pass_pattern \
     " =
core::option::Option<\[a-z\]+::string::String>::Some\\(\[a-z\]+::string::String
.*"
 set xfail_pattern \
-    " = (<error reading variable>|That operation is not available on .*)"
+    "( = <error reading variable>|That operation is not available on .*)"
 gdb_test_multiple "print str_some" "" {
     -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
        pass $gdb_test_name
...
we have:
...
FAIL: gdb.rust/simple.exp: python
print(gdb.lookup_type('simple::MoreComplicated').dynamic)

                === gdb Summary ===

# of expected passes            301
# of unexpected failures        1
# of expected failures          5
# of untested testcases         1
# of paths in test names        1
...

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