Left shift in binary expression op is lexed as two < instead of as <<

[dsherret]

Describe the bug

Probably caused by https://github.com/swc-project/swc/pull/7439/files

Tokens for `a << 1`: [
    TokenAndSpan {
        token: a,
        had_line_break: false,
        span: Span {
            lo: BytePos(
                101,
            ),
            hi: BytePos(
                102,
            ),
            ctxt: #0,
        },
    },
    TokenAndSpan {
        token: <,
        had_line_break: false,
        span: Span {
            lo: BytePos(
                103,
            ),
            hi: BytePos(
                104,
            ),
            ctxt: #0,
        },
    },
    TokenAndSpan {
        token: <,
        had_line_break: false,
        span: Span {
            lo: BytePos(
                104,
            ),
            hi: BytePos(
                105,
            ),
            ctxt: #0,
        },
    },
    TokenAndSpan {
        token: numeric literal (1, 1),
        had_line_break: false,
        span: Span {
            lo: BytePos(
                106,
            ),
            hi: BytePos(
                107,
            ),
            ctxt: #0,
        },
    },
]

Input code

const test = a << 1;

Config

No response

Playground link

No response

Expected behavior

Lexed as a, <<, 1

Actual behavior

Lexed as a, <, <, 1

Version

swc_ecma_parser 0.137.1

Additional context

No response

[dsherret]

One interesting point is that the op in the AST is correctly parsed as <<, so maybe this is not considered a bug, but it would be nice if they aligned. (I do wonder if the backtracking is causing issues though)

[kdy1]

Can you post the rust code?

[kdy1]

Ah nevermind I know the cause

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.