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coverage: Add a specific test for #[rustfmt::skip]

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	`1`	`+Function name: rustfmt_skip::main`
	`2`	`+Raw bytes (24): 0x[01, 01, 00, 04, 01, 0a, 01, 00, 0a, 01, 02, 05, 00, 0d, 01, 03, 09, 00, 10, 01, 02, 01, 00, 02]`
	`3`	`+Number of files: 1`
	`4`	`+- file 0 => $DIR/rustfmt-skip.rs`
	`5`	`+Number of expressions: 0`
	`6`	`+Number of file 0 mappings: 4`
	`7`	`+- Code(Counter(0)) at (prev + 10, 1) to (start + 0, 10)`
	`8`	`+- Code(Counter(0)) at (prev + 2, 5) to (start + 0, 13)`
	`9`	`+- Code(Counter(0)) at (prev + 3, 9) to (start + 0, 16)`
	`10`	`+- Code(Counter(0)) at (prev + 2, 1) to (start + 0, 2)`
	`11`	`+Highest counter ID seen: c0`
	`12`	`+`

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	`1`	`+ LL\| \|//@ edition: 2024`
	`2`	`+ LL\| \|`
	`3`	+ LL\| \|// The presence of `#[rustfmt::skip]` on a function should not cause macros
	`4`	`+ LL\| \|// within that function to mysteriously not be instrumented.`
	`5`	`+ LL\| \|//`
	`6`	`+ LL\| \|// This test detects problems that can occur when building an expansion tree`
	`7`	+ LL\| \|// based on `ExpnData::parent` instead of `ExpnData::call_site`, for example.
	`8`	`+ LL\| \|`
	`9`	`+ LL\| \|#[rustfmt::skip]`
	`10`	`+ LL\| 1\|fn main() {`
	`11`	`+ LL\| \| // Ensure a gap between the body start and the first statement.`
	`12`	`+ LL\| 1\| println!(`
	`13`	`+ LL\| \| // Keep this on a separate line, to distinguish instrumentation of`
	`14`	+ LL\| \| // `println!` from instrumentation of its arguments.
	`15`	`+ LL\| 1\| "hello"`
	`16`	`+ LL\| \| );`
	`17`	`+ LL\| 1\|}`
	`18`	`+`

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	`1`	`+//@ edition: 2024`
	`2`	`+`
	`3`	+// The presence of `#[rustfmt::skip]` on a function should not cause macros
	`4`	`+// within that function to mysteriously not be instrumented.`
	`5`	`+//`
	`6`	`+// This test detects problems that can occur when building an expansion tree`
	`7`	+// based on `ExpnData::parent` instead of `ExpnData::call_site`, for example.
	`8`	`+`
	`9`	`+#[rustfmt::skip]`
	`10`	`+fn main() {`
	`11`	`+ // Ensure a gap between the body start and the first statement.`
	`12`	`+ println!(`
	`13`	`+ // Keep this on a separate line, to distinguish instrumentation of`
	`14`	+ // `println!` from instrumentation of its arguments.
	`15`	`+ "hello"`
	`16`	`+ );`
	`17`	`+}`

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