SC2140 false-positive with backslash for long strings

[The-Compiler]

For bugs

• Rule Id (if any, e.g. SC1000): SC2140
• My shellcheck version (shellcheck --version or "online"): 0.8.0
• [x] The rule's wiki page does not already cover this (e.g. https://shellcheck.net/wiki/SC2086)
• [x] I tried on https://www.shellcheck.net/ and verified that this is still a problem on the latest commit

Here's a snippet or screenshot that shows the problem:

#!/bin/bash
msg="this is a very long string which does not fit on a single line"\
"long string continues here"
echo "$msg"

Here's what shellcheck currently says:

In screpro.sh line 2:
msg="this is a very long string which does not fit on a single line"\
                                                                    ^-- SC2140 (warning): Word is of the form "A"B"C" (B indicated). Did you mean "ABC" or "A\"B\"C"?

For more information:
  https://www.shellcheck.net/wiki/SC2140 -- Word is of the form "A"B"C" (B in...

Here's what I wanted or expected to see:

No error - though a space before \ or the following " makes it go away, it seems confusing here.

[mschilli87]

I think the error is pointing out that the quotes (") sorrounding the (escaped) newline are superfluous:

#!/bin/bash
msg="this is a very long string which does not fit on a single line\
long string continues here"
echo "$msg"

should do the same an not trigger the rule.

---

edit:

To clarify the message:

• A → this is a very long string which does not fit on a single line
• B → \[newline]
• C → long string continues here and thus
• msg → "A"B"C" (rather than "ABC")