---

yaml
---
r: 92341
b: refs/heads/auto
c: 9384de7
h: refs/heads/master
i:
  92339: 7005c0d
v: v3

Author: michaelwoerister

[refs]

@@ -13,7 +13,7 @@ refs/heads/try3: 9387340aab40a73e8424c48fd42f0c521a4875c0
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: d35fff89944f583f4f96b384e3f5d075503e0d36
+refs/heads/auto: 9384de77bbc8edf5e7c7c1a84e79cd29588cdee9
 refs/heads/servo: af82457af293e2a842ba6b7759b70288da276167
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336

branches/auto/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| {