From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/ui/proc-macro/auxiliary/cond_plugin.rs | 38 +++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/test/ui/proc-macro/auxiliary/cond_plugin.rs

(limited to 'src/test/ui/proc-macro/auxiliary/cond_plugin.rs')

diff --git a/src/test/ui/proc-macro/auxiliary/cond_plugin.rs b/src/test/ui/proc-macro/auxiliary/cond_plugin.rs
new file mode 100644
index 000000000..8d3c4ec23
--- /dev/null
+++ b/src/test/ui/proc-macro/auxiliary/cond_plugin.rs
@@ -0,0 +1,38 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+#![feature(proc_macro_quote)]
+
+extern crate proc_macro;
+
+use proc_macro::*;
+
+#[proc_macro]
+pub fn cond(input: TokenStream) -> TokenStream {
+    let mut conds = Vec::new();
+    let mut input = input.into_iter().peekable();
+    while let Some(tree) = input.next() {
+        let cond = match tree {
+            TokenTree::Group(tt) => tt.stream(),
+            _ => panic!("Invalid input"),
+        };
+        let mut cond_trees = cond.clone().into_iter();
+        let test = cond_trees.next().expect("Unexpected empty condition in `cond!`");
+        let rhs = cond_trees.collect::<TokenStream>();
+        if rhs.is_empty() {
+            panic!("Invalid macro usage in cond: {}", cond);
+        }
+        let is_else = match test {
+            TokenTree::Ident(ref word) => &*word.to_string() == "else",
+            _ => false,
+        };
+        conds.push(if is_else || input.peek().is_none() {
+            quote!({ $rhs })
+        } else {
+            quote!(if $test { $rhs } else)
+        });
+    }
+
+    conds.into_iter().flat_map(|x| x.into_iter()).collect()
+}
-- 
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