feat: support binary octal and hexadecimal integer literals

compiler/lexer/lexer.odin

@@ -411,6 +411,35 @@ lex :: proc(
 		case:
 			if value >= '0' && value <= '9' {
 				start := cursor
+				base: byte
+				if value == '0' && cursor+1 < len(bytes) {
+					switch bytes[cursor+1] {
+					case 'b', 'B': base = 2
+					case 'o', 'O': base = 8
+					case 'x', 'X': base = 16
+					}
+				}
+				if base != 0 {
+					cursor += 2
+					digits_start := cursor
+					valid := true
+					for cursor < len(bytes) && is_identifier_continue(bytes[cursor]) {
+						digit := bytes[cursor]
+						valid = valid && is_hex_digit(digit) && (base == 16 || digit-'0' < base)
+						cursor += 1
+					}
+					if !valid || cursor == digits_start {
+						id := source.add(
+							diagnostics,
+							source.Span{file=source_file.id, start=source.Offset(start), end=source.Offset(cursor)},
+							"invalid digits in prefixed integer literal",
+						)
+						append_token(&stream, source_file, .Invalid, start, cursor, diagnostic=id)
+					} else {
+						append_token(&stream, source_file, .Integer, start, cursor)
+					}
+					continue
+				}
 				for cursor < len(bytes) && bytes[cursor] >= '0' && bytes[cursor] <= '9' {
 					cursor += 1
 				}