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pub fn is_rust_fence(s: &str) -> bool {
let mut seen_rust_tags = false;
let mut seen_other_tags = false;
let tokens = s
.trim()
.split(|c| c == ',' || c == ' ' || c == '\t')
.map(str::trim)
.filter(|t| !t.is_empty());
for token in tokens {
match token {
"should_panic" | "no_run" | "ignore" | "allow_fail" => {
seen_rust_tags = !seen_other_tags
}
"rust" => seen_rust_tags = true,
"test_harness" | "compile_fail" => seen_rust_tags = !seen_other_tags || seen_rust_tags,
x if x.starts_with("edition") => {}
x if x.starts_with('E') && x.len() == 5 => {
if x[1..].parse::<u32>().is_ok() {
seen_rust_tags = !seen_other_tags || seen_rust_tags;
} else {
seen_other_tags = true;
}
}
_ => seen_other_tags = true,
}
}
!seen_other_tags || seen_rust_tags
}