rustup 1.23.0 (2020-11-27) introduced support for TOML syntax for the
toolchain file. Use this and specify required compoenents.
To ensure you are using a new enough rustup, run:
    rustup self update
		
	
		
			
				
	
	
		
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[toolchain]
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channel = "nightly-2020-07-27"
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components = ["rust-src"]
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