Auto merge of #44919 - diwic:79-pretty-mir, r=arielb1

Mir pretty print: Add cleanup comment

I found it useful to add a comment indicating whether or not a
BasicBlock is a cleanup block or not. Hopefully you'll find it
useful too.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/librustc_mir/util/pretty.rs b/src/librustc_mir/util/pretty.rs
index 0811783a9e5..9e1f05f6d2f 100644
--- a/src/librustc_mir/util/pretty.rs
+++ b/src/librustc_mir/util/pretty.rs
@@ -188,7 +188,9 @@ pub fn write_basic_block(tcx: TyCtxt,
     let data = &mir[block];
 
     // Basic block label at the top.
-    writeln!(w, "{}{:?}: {{", INDENT, block)?;
+    let cleanup_text = if data.is_cleanup { " // cleanup" } else { "" };
+    let lbl = format!("{}{:?}: {{", INDENT, block);
+    writeln!(w, "{0:1$}{2}", lbl, ALIGN, cleanup_text)?;
 
     // List of statements in the middle.
     let mut current_location = Location { block: block, statement_index: 0 };