Lexer: check in advance_token to avoid regard spare ## as GardedStrPrefix#141028
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xizheyin wants to merge 2 commits intorust-lang:masterfrom
Open
Lexer: check in `advance_token` to avoid regard spare `##` as `GardedStrPrefix`#141028xizheyin wants to merge 2 commits intorust-lang:masterfrom
xizheyin wants to merge 2 commits intorust-lang:masterfrom
