[Tools] Add a reminder to run the tool as root if the target can't be inspected.

mikeash · airspeedswift · commit 7bc6058ee859 · 2020-05-29T08:31:03.000-07:00
rdar://problem/55481578
diff --git a/tools/swiftdt/main.swift b/tools/swiftdt/main.swift
@@ -115,7 +115,7 @@ func makeReflectionContext(args: inout ArraySlice<String>)
   }
 
   guard let inspector = Inspector(pid: pid) else {
-    argFail("Failed to inspect pid \(pid)")
+    argFail("Failed to inspect pid \(pid) (are you running as root?)")
   }
 
   guard let reflectionContext

Original file line number	Diff line number	Diff line change
`@@ -115,7 +115,7 @@ func makeReflectionContext(args: inout ArraySlice<String>)`
`115`	`115`	`}`
`116`	`116`
`117`	`117`	`guard let inspector = Inspector(pid: pid) else {`
`118`		`- argFail("Failed to inspect pid \(pid)")`
	`118`	`+ argFail("Failed to inspect pid \(pid) (are you running as root?)")`
`119`	`119`	`}`
`120`	`120`
`121`	`121`	`guard let reflectionContext`