/usr/share/SuperCollider/SCClassLibrary/deprecated/deprecated-3.7.sc is in supercollider-common 1:3.6.3~repack-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102  | // in 3.6, both "help" and "openHelpFile" will work fine. In 3.7, "openHelpFile" will be deprecated. In 3.8 it will be gone.
+ Object {
	openHelpFile {
		this.help
	}
}
+ String {
	openHelpFile {
		this.help
	}
}
+ Method {
	openHelpFile {
		this.help
	}
}
+ Quark {
	openHelpFile {
		this.help
	}
}
// openTextFile is actually the same as openDocument
+ String {
	openTextFile { arg selectionStart=0, selectionLength=0;
		this.openDocument(selectionStart, selectionLength)
	}
}
+ Symbol {
	openTextFile { arg selectionStart=0, selectionLength=0;
		^this.openDocument(selectionStart, selectionLength)
	}
}
// Document: themes are cocoa-specific
+ Document {
	*theme_ { |...args|
		this.deprecated(thisMethod);
		this.implementationClass.tryPerform(\theme_, args)
	}
	*theme {
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\theme)
	}
	*postColor {
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\postColor)
	}
	*postColor_ {|...args|
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\postColor_, args)
	}
	*background {
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\background)
	}
	*background_ {|...args|
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\background_, args)
	}
	*selectedBackground {
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\selectedBackground)
	}
	*selectedBackground_ {|...args|
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\selectedBackground_, args)
	}
	*stringColor_ {|...args|
		this.deprecated(thisMethod);
		^this.implementationClass.tryPerform(\stringColor_, args)
	}
	setFont { | ...args |
		this.deprecated(thisMethod);
		^this.subclassResponsibility(thisMethod)
	}
	setTextColor { | ...args |
		this.deprecated(thisMethod);
		^this.subclassResponsibility(thisMethod)
	}
	syntaxColorize {
		this.deprecated(thisMethod);
		^this.subclassResponsibility(thisMethod)
	}
}
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