Literal expressions

^Syntax
LiteralExpression :
CHAR_LITERAL
| STRING_LITERAL
| RAW_STRING_LITERAL
| BYTE_LITERAL
| BYTE_STRING_LITERAL
| RAW_BYTE_STRING_LITERAL
| INTEGER_LITERAL
| FLOAT_LITERAL
| BOOLEAN_LITERAL

A literal expression consists of one of the literal forms described earlier. It directly describes a number, character, string, or boolean value.

#![allow(unused)]
fn main() {
"hello";   // string type
'5';       // character type
5;         // integer type
}