introduce test for 146808

Author: jdonszelmann

tests/ui/parser/attribute/auxiliary/all_spans_same.rs

@@ -0,0 +1,26 @@
+extern crate proc_macro;
+use proc_macro::*;
+
+fn spans_callsite(ts: TokenStream) -> TokenStream {
+    let mut new_ts = TokenStream::new();
+
+    for i in ts {
+        let new_token = i.clone();
+        match new_token {
+            TokenTree::Group(g) => {
+                new_ts.extend([Group::new(g.delimiter(), spans_callsite(g.stream()))])
+            }
+            mut other => {
+                other.set_span(Span::call_site());
+                new_ts.extend([other]);
+            }
+        }
+    }
+
+    new_ts
+}
+
+#[proc_macro_attribute]
+pub fn all_spans_same(_: TokenStream, ts: TokenStream) -> TokenStream {
+    spans_callsite(ts)
+}

tests/ui/parser/attribute/invalid-delimeter-ice-146808.rs

@@ -0,0 +1,7 @@
+// regression test for #146808
+//@ proc-macro: all_spans_same.rs
+extern crate all_spans_same;
+
+#[all_spans_same::all_spans_same]
+#[allow{}]
+fn main() {}