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	 0900712fe0
			
		
	
	
		0900712fe0
		
			
		
	
	
	
	
		
			
			add diagnostic for raw identifiers in format string
Format strings don't support raw identifiers (e.g. `format!("{r#type}")`), but they do support keywords in the format string directly (e.g. `format!("{type}")`). This PR improves the error output when attempting to use a raw identifier in a format string and adds a machine-applicable suggestion to remove the `r#`.
fixes https://github.com/rust-lang/rust/issues/115466