According to MISRA 2008, concatenation of wide and narrow string literals leads to undefined behavior. This is an implicit undefined behavior according to C99 to the C standard [ISO/IEC 9899:19992011].
Noncompliant Code Example
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wchar_t *msg = L"This message is very long, so I want to divide it "
"into two parts.";
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wchar_t *msg = L"This message is very long, so I want to divide it "
L"into two parts.";
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char *msg = "This message is very long, so I want to divide it "
"into two parts.";
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