[llvm-bugs] [Bug 43742] New: Nesting "command source" scripts asserts when target already created

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https://bugs.llvm.org/show_bug.cgi?id=43742

            Bug ID: 43742
           Summary: Nesting "command source" scripts asserts when target
                    already created
           Product: lldb
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: thomas.goodfellow at gmail.com
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

Created attachment 22697
  --> https://bugs.llvm.org/attachment.cgi?id=22697&action=edit
Pair of trivial scripts demonstrating bug

With a Debug build of the current (post-9.0 release) lldb sourcing a command
script from another command script crashes, e.g. where "a.script" contains just
"command source b.script" (also as attached files) then this crashes:

$ lldb -f test_executable -s a.script
(lldb) target create "test_executable"
Current executable set to './test_executable' (x86_64).
(lldb) command source a.script
Executing commands in './a.script'.
(lldb) command source b.script
lldb:
/space/user/thomasg/led/llvm-project/lldb/source/Interpreter/CommandObject.cpp:144:
bool
lldb_private::CommandObject::CheckRequirements(lldb_private::CommandReturnObject&):
Assertion `!m_exe_ctx.GetTargetPtr()' failed.

The assert() only trips if the target creation has occurred, i.e. changing the
above invocation to "lldb -f test_executable -S a.script" succeeds. 

It's clearly similar though not obviously identical to bug 39954.

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