From 041a064424bbbc7ce3531cb161c09aa6de259311 Mon Sep 17 00:00:00 2001
From: Artem Chikin <achikin@apple.com>
Date: Thu, 1 Dec 2022 12:48:45 -0800
Subject: [PATCH] Rephrase use of 'guard let' not supported by older compilers.

'guard let X else {}' works with latest Swift compilers (such as one used in swift-driver CI) but isn't supported in some older compilres used in CI and other bots.
---
 Sources/SwiftDriver/Jobs/Planning.swift | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Sources/SwiftDriver/Jobs/Planning.swift b/Sources/SwiftDriver/Jobs/Planning.swift
index c0b42d662..c91f523b2 100644
--- a/Sources/SwiftDriver/Jobs/Planning.swift
+++ b/Sources/SwiftDriver/Jobs/Planning.swift
@@ -197,10 +197,11 @@ extension Driver {
   throws {
     // If asked, add jobs to precompile module dependencies
     guard parsedOptions.contains(.driverExplicitModuleBuild) else { return }
-    guard let dependencyGraph else {
+    guard let resolvedDependencyGraph = dependencyGraph else {
       fatalError("Attempting to plan explicit dependency build without a dependency graph")
     }
-    let modulePrebuildJobs = try generateExplicitModuleDependenciesJobs(dependencyGraph: dependencyGraph)
+    let modulePrebuildJobs =
+        try generateExplicitModuleDependenciesJobs(dependencyGraph: resolvedDependencyGraph)
     modulePrebuildJobs.forEach(addJob)
   }