From 8d612de7b0e9a07711db86e6cbc1a7e04194b847 Mon Sep 17 00:00:00 2001
From: Dale Wijnand <dale.wijnand@gmail.com>
Date: Wed, 16 Oct 2024 20:35:54 +0100
Subject: [PATCH] Add a >0.1s timer to trace

---
 compiler/src/dotty/tools/dotc/reporting/trace.scala      | 9 ++++++++-
 .../src/dotty/tools/dotc/typer/ImportSuggestions.scala   | 2 +-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/compiler/src/dotty/tools/dotc/reporting/trace.scala b/compiler/src/dotty/tools/dotc/reporting/trace.scala
index 732e779e9bf7..7f05cffb422a 100644
--- a/compiler/src/dotty/tools/dotc/reporting/trace.scala
+++ b/compiler/src/dotty/tools/dotc/reporting/trace.scala
@@ -96,6 +96,7 @@ trait TraceSyntax:
                         (op: => T)(using Context): T =
     if ctx.mode.is(Mode.Printing) || !isForced && (printer eq Printers.noPrinter) then op
     else
+      val start = System.nanoTime
       // Avoid evaluating question multiple time, since each evaluation
       // may cause some extra logging output.
       val q = question
@@ -109,7 +110,13 @@ trait TraceSyntax:
       def finalize(msg: String) =
         if !finalized then
           ctx.base.indent -= 1
-          doLog(s"$margin$msg")
+          val stop = System.nanoTime
+          val diffNs = stop - start
+          val diffS = (diffNs / 1000 / 1000).toInt / 1000.0
+          if diffS > 0.1 then
+            doLog(s"$margin$msg (${"%.2f".format(diffS)} s)")
+          else
+            doLog(s"$margin$msg")
           finalized = true
       try
         doLog(s"$margin$leading")
diff --git a/compiler/src/dotty/tools/dotc/typer/ImportSuggestions.scala b/compiler/src/dotty/tools/dotc/typer/ImportSuggestions.scala
index 8f8c51e2f566..3ae533d58b2e 100644
--- a/compiler/src/dotty/tools/dotc/typer/ImportSuggestions.scala
+++ b/compiler/src/dotty/tools/dotc/typer/ImportSuggestions.scala
@@ -264,7 +264,7 @@ trait ImportSuggestions:
   end importSuggestions
 
   /** Reduce next timeout for import suggestions by the amount of time it took
-   *  for current search, but but never less than to half of the previous budget.
+   *  for current search, but never less than to half of the previous budget.
    */
   private def reduceTimeBudget(used: Int)(using Context) =
     val run = ctx.run.nn