vscode/extensions/rust/language-configuration.json

{
	"comments": {
		"lineComment": "//",
		"blockComment": [
			"/*",
			"*/"
		]
	},
	"brackets": [
		[
			"{",
			"}"
		],
		[
			"[",
			"]"
		],
		[
			"(",
			")"
		]
	],
	"autoClosingPairs": [
		[
			"{",
			"}"
		],
		[
			"[",
			"]"
		],
		[
			"(",
			")"
		],
		{
			"open": "\"",
			"close": "\"",
			"notIn": [
				"string"
			]
		}
	],
	"surroundingPairs": [
		[
			"{",
			"}"
		],
		[
			"[",
			"]"
		],
		[
			"(",
			")"
		],
		[
			"\"",
			"\""
		],
		[
			"<",
			">"
		]
	],
	"indentationRules": {
		"increaseIndentPattern": "^.*\\{[^}\"']*$|^.*\\([^\\)\"']*$",
		"decreaseIndentPattern": "^\\s*(\\s*\\/[*].*[*]\\/\\s*)*[})]"
	},
	"folding": {
		"markers": {
			"start": "^\\s*//\\s*#?region\\b",
			"end": "^\\s*//\\s*#?endregion\\b"
		}
	},
	"onEnterRules": [
		// Add // when pressing enter from inside line comment
		{
			"beforeText": {
				"pattern": "\/\/.*"
			},
			"afterText": {
				"pattern": "^(?!\\s*$).+"
			},
			"action": {
				"indent": "none",
				"appendText": "// "
			}
		},
	]
}