Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

It is valid Python syntax, so SyntaxErorr cannot be raised.

SyntaxWarning is an option, but the Python compiler only emits it if we 
absolutely sure that the code contains a bug (either it does not work as 
intended or can work differently on other implementations or in future Python 
releases). And I am afraid that a lot of correct code (including the stdlib) 
contains implicit string concatentation in list.

It is better to left such warning on third-party checkers which have options to 
control what warnings to emit, and not enable it by default.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue43692>
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