Unescaped multiline strings are deprecated since version 3.4.0 and should not be used anymore.

Noncompliant Code Example

@error "blabla...
        blabla...
        blabla...";

Compliant Solution

Add \ at the end of each line to escape the multiline string. Also add \a to add a carriage return.

@error "blabla...\a\
        blabla...\a\
        blabla...";