C:\test>type junk.c
/*
char x[] = "/* comment */";
*/

int n = 1;
C:\test>cl /Wall -c junk.c
Microsoft (R) C/C++ Optimizing Compiler Version 15.00.21022.08 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

junk.c
junk.c(2) : error C2001: newline in constant
junk.c(2) : error C2059: syntax error : 'string'
junk.c(3) : warning C4138: '*/' found outside of comment