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d3debc0037
Remove `__rust_force_expr`. This was added (with a different name) to improve an error message. It is no longer needed -- removing it changes the error message, but overall I think the new message is no worse: - the mention of `#` in the first line is a little worse, - but the extra context makes it very clear what the problem is, perhaps even clearer than the old message, - and the removal of the note about the `expr` fragment (an internal detail of `__rust_force_expr`) is an improvement. Overall I think the error is quite clear and still far better than the old message that prompted #61933, which didn't even mention patterns. The motivation for this is #124141, which will cause pasted metavariables to be tokenized and reparsed instead of the AST node being cached. This change in behaviour occasionally has a non-zero perf cost, and `__rust_force_expr` causes the tokenize/reparse step to occur twice. Removing `__rust_force_expr` greatly reduces the extra overhead for the `deep-vector` benchmark. r? ```@oli-obk```