chore: checkpoint before Python removal

vendor/nom/tests/fnmut.rs

@@ -0,0 +1,40 @@
+use nom::{
+  bytes::complete::tag,
+  multi::{many, many0_count},
+  Parser,
+};
+
+#[test]
+fn parse() {
+  let mut counter = 0;
+
+  let res = {
+    let mut parser = many::<_, (), Vec<&str>, _, _>(0.., |i| {
+      counter += 1;
+      tag("abc")(i)
+    });
+
+    parser.parse("abcabcabcabc").unwrap()
+  };
+
+  println!("res: {:?}", res);
+  assert_eq!(counter, 5);
+}
+
+#[test]
+fn accumulate() {
+  let mut v = Vec::new();
+
+  let (_, count) = {
+    let mut parser = many0_count::<_, (), _>(|i| {
+      let (i, o) = tag("abc")(i)?;
+      v.push(o);
+      Ok((i, ()))
+    });
+    parser.parse("abcabcabcabc").unwrap()
+  };
+
+  println!("v: {:?}", v);
+  assert_eq!(count, 4);
+  assert_eq!(v.len(), 4);
+}