From 331f3eb063ceb772f8a5b5b12da1383614285b45 Mon Sep 17 00:00:00 2001
From: Ottmar Zittlau <ozteopat@gmx.net>
Date: Sun, 5 Jan 2025 13:14:19 +0100
Subject: [PATCH] Fix unchecked optional access in compile subcommand

---
 toolchain/driver/compile_subcommand.cpp | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/toolchain/driver/compile_subcommand.cpp b/toolchain/driver/compile_subcommand.cpp
index 175a0c6313063..f0cb9e47d1e85 100644
--- a/toolchain/driver/compile_subcommand.cpp
+++ b/toolchain/driver/compile_subcommand.cpp
@@ -369,14 +369,17 @@ class CompilationUnit {
       source_ = SourceBuffer::MakeFromFileOrStdin(*driver_env_->fs,
                                                   input_filename_, *consumer_);
     });
-    if (mem_usage_) {
-      mem_usage_->Add("source_", source_->text().size(),
-                      source_->text().size());
-    }
+
     if (!source_) {
       success_ = false;
       return;
     }
+
+    if (mem_usage_) {
+      mem_usage_->Add("source_", source_->text().size(),
+                      source_->text().size());
+    }
+
     CARBON_VLOG("*** SourceBuffer ***\n```\n{0}\n```\n", source_->text());
 
     LogCall("Lex::Lex", "lex",