[llvm] [lit] Clean up internal shell parse errors with ScriptFatal (PR #68496)

[Vlad Serebrennikov via llvm-commits]

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@@ -1009,15 +1021,18 @@ def formatOutput(title, data, limit=None):
     return out
 
 
-# Normally returns out, err, exitCode, timeoutInfo.
+# Always either returns the tuple (out, err, exitCode, timeoutInfo) or raises a
+# ScriptFatal exception.
 #
 # If debug is True (the normal lit behavior), err is empty, and out contains an
 # execution trace, including stdout and stderr shown per command executed.
 #
 # If debug is False (set by some custom lit test formats that call this
 # function), out contains only stdout from the script, err contains only stderr
 # from the script, and there is no execution trace.
-def executeScriptInternal(test, litConfig, tmpBase, commands, cwd, debug=True):
+def executeScriptInternal(
+    test, litConfig, tmpBase, commands, cwd, debug=True
+) -> typing.Tuple[str, str, int, typing.Optional[str]]:
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Endilll wrote:

I suggest `from typing import Optional, Tuple` to reduce noise in type annotations.

https://github.com/llvm/llvm-project/pull/68496