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#include <stdio.h>
 
int main(void) {
	int val = 0;
 
    switch( val ) {
    case 0:
        int b = 8;
        break;
    case 2:
        int b = 4;
        break;
    }
 
	return 0;
}
 

prog.c: In function 'main':
prog.c:8:9: error: a label can only be part of a statement and a declaration is not a statement
         int b = 8;
         ^
prog.c:11:9: error: a label can only be part of a statement and a declaration is not a statement
         int b = 4;
         ^
prog.c:11:13: error: redefinition of 'b'
         int b = 4;
             ^
prog.c:8:13: note: previous definition of 'b' was here
         int b = 8;
             ^
prog.c:11:13: warning: unused variable 'b' [-Wunused-variable]
         int b = 4;
             ^

Standard output is empty