/in/foo.c:1:1: error: expected identifier or '(' before '/' token
 /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
 ^
/in/foo.c:1:80: error: stray '`' in program
 /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
                                                                                ^
/in/foo.c:1:87: warning: missing terminating ' character
 /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
                                                                                       ^
/in/foo.c:1:87: error: missing terminating ' character
 /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
                                                                                       ^~
/in/foo.c:2:38: error: stray '`' in program
 (.text+0x20): undefined reference to `main'
                                      ^
/in/foo.c:2:43: warning: missing terminating ' character
 (.text+0x20): undefined reference to `main'
                                           ^
/in/foo.c:2:43: error: missing terminating ' character