1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/rust/syn/tests/test_path.rs b/third_party/rust/syn/tests/test_path.rs
new file mode 100644
index 0000000000..2ce12066f5
--- /dev/null
+++ b/third_party/rust/syn/tests/test_path.rs
@@ -0,0 +1,52 @@
+#[macro_use]
+mod macros;
+
+use proc_macro2::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree};
+use quote::quote;
+use std::iter::FromIterator;
+use syn::{Expr, Type};
+
+#[test]
+fn parse_interpolated_leading_component() {
+    // mimics the token stream corresponding to `$mod::rest`
+    let tokens = TokenStream::from_iter(vec![
+        TokenTree::Group(Group::new(Delimiter::None, quote! { first })),
+        TokenTree::Punct(Punct::new(':', Spacing::Joint)),
+        TokenTree::Punct(Punct::new(':', Spacing::Alone)),
+        TokenTree::Ident(Ident::new("rest", Span::call_site())),
+    ]);
+
+    snapshot!(tokens.clone() as Expr, @r###"
+    Expr::Path {
+        path: Path {
+            segments: [
+                PathSegment {
+                    ident: "first",
+                    arguments: None,
+                },
+                PathSegment {
+                    ident: "rest",
+                    arguments: None,
+                },
+            ],
+        },
+    }
+    "###);
+
+    snapshot!(tokens as Type, @r###"
+    Type::Path {
+        path: Path {
+            segments: [
+                PathSegment {
+                    ident: "first",
+                    arguments: None,
+                },
+                PathSegment {
+                    ident: "rest",
+                    arguments: None,
+                },
+            ],
+        },
+    }
+    "###);
+}