---

yaml
---
r: 88655
b: refs/heads/snap-stage3
c: 9384de7
h: refs/heads/master
i:
  88653: 5ad1615
  88651: 85195ac
  88647: 69efd50
  88639: 8c89ce4
v: v3

Author: michaelwoerister

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: deeca5d586bfaa4aa60246f671a8d611d38f6248
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: d35fff89944f583f4f96b384e3f5d075503e0d36
+refs/heads/snap-stage3: 9384de77bbc8edf5e7c7c1a84e79cd29588cdee9
 refs/heads/try: b160761e35efcd1207112b3b782c06633cf441a8
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/librustc/middle/trans/debuginfo.rs

@@ -690,6 +690,13 @@ pub fn create_function_debug_context(cx: &mut CrateContext,
 
     // Clang sets this parameter to the opening brace of the function's block, so let's do this too.
     let scope_line = span_start(cx, top_level_block.span).line;
+
+    // The is_local_to_unit flag indicates whether a function is local to the current compilation
+    // unit (i.e. if it is *static* in the C-sense). The *reachable* set should provide a good
+    // approximation of this, as it contains everything that might leak out of the current crate
+    // (by being externally visible or by being inlined into something externally visible). It might
+    // better to use the `exported_items` set from `driver::CrateAnalysis` in the future, but (atm)
+    // this set is not available in the translation pass.
     let is_local_to_unit = !cx.reachable.contains(&fn_ast_id);
 
     let fn_metadata = function_name.with_c_str(|function_name| {