Closed
Description
The reference grammar in rust/src/grammar/lexer.l
returns LIT_INTEGER
for any sort of integer, including hex, octal, etc.
Then parser-lalr.y
implements tuple field expressions as:
| expr '.' LIT_INTEGER { $$ = mk_node("ExprTupleIndex", 1, $1); }
However, rustc rejects hexadecimal here:
b7.rs:4:31: 4:34 error: invalid tuple or tuple struct index
b7.rs:4 println!("{}, {}", x.0, x.0x1);
My guess is that the reference lexer is incorrect here.