From 2932a9314dca1a6ccb3de70bf505c84419a25aa9 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Wed, 25 Oct 2017 11:17:29 -0700
Subject: [PATCH] Don't allocate srclocs if we only have default SourceLoc
 values.

This avoids needless extra indentation in `write_function` in the
case where no SourceLoc information is available.
---
 lib/frontend/src/frontend.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/frontend/src/frontend.rs b/lib/frontend/src/frontend.rs
index 0534fa487d..92eca41dcc 100644
--- a/lib/frontend/src/frontend.rs
+++ b/lib/frontend/src/frontend.rs
@@ -132,7 +132,9 @@ impl<'short, 'long, Variable> InstBuilderBase<'short> for FuncInstBuilder<'short
         let inst = self.builder.func.dfg.make_inst(data.clone());
         self.builder.func.dfg.make_inst_results(inst, ctrl_typevar);
         self.builder.func.layout.append_inst(inst, self.ebb);
-        self.builder.func.srclocs[inst] = self.builder.srcloc;
+        if !self.builder.srcloc.is_default() {
+            self.builder.func.srclocs[inst] = self.builder.srcloc;
+        }
 
         if data.opcode().is_branch() {
             match data.branch_destination() {