Add chars

src/grammar.pest

@@ -13,9 +13,10 @@ operator = { "+" | "-" | "*" | "/" | "&&" | "||" }
 ident         = @{ ALPHABETIC ~ (ALPHABETIC | NUMBER | "_")* | quoted_indent }
 quoted_indent = _{ "`" ~ (!"`" ~ ANY)+ ~ "`" }
 
-literal = { string | number | boolean }
+literal = { string | number | boolean | char }
 
 string  =  { "\"" ~ (!"\"" ~ ANY)* ~ "\"" }
+char    =  { "'" ~ !"'" ~ ANY ~ "'" }
 number  = _{ byte | float | integer }
 integer = @{ "-"? ~ ASCII_DIGIT+ }
 float   = @{

src/test/literals.rs

@@ -75,6 +75,20 @@ fn it_parses_strings() {
     ]);
 }
 
+#[test]
+fn it_parses_chars() {
+    parses_to!(parser: SnekParser, input: "'c'", rule: Rule::literal, tokens: [
+        literal(0, 3, [
+            char(0, 3)
+        ])
+    ]);
+    parses_to!(parser: SnekParser, input: r"'\''", rule: Rule::literal, tokens: [
+        literal(0, 3, [
+            char(0, 3)
+        ])
+    ]);
+}
+
 #[test]
 fn it_parses_booleans() {
     parses_to!(parser: SnekParser, input: "true", rule: Rule::literal, tokens: [