From c9f4a412763ef46ed20c72a9d7fe2cca817d3817 Mon Sep 17 00:00:00 2001
From: Son Ho
Date: Thu, 14 Sep 2023 07:50:13 +0200
Subject: Fix panic issues with the progress tactic

---
 backends/lean/Base/Progress/Progress.lean | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'backends/lean/Base')

diff --git a/backends/lean/Base/Progress/Progress.lean b/backends/lean/Base/Progress/Progress.lean
index 6a4729dc..afe3056e 100644
--- a/backends/lean/Base/Progress/Progress.lean
+++ b/backends/lean/Base/Progress/Progress.lean
@@ -314,12 +314,14 @@ def evalProgress (args : TSyntax `Progress.progressArgs) : TacticM Unit := do
     else pure none
   let ids :=
     let args := asArgs.getArgs
-    let args := (args.get! 2).getSepArgs
-    args.map (λ s => if s.isIdent then some s.getId else none)
+    if args.size > 2 then
+      let args := (args.get! 2).getSepArgs
+      args.map (λ s => if s.isIdent then some s.getId else none)
+    else #[]
   trace[Progress] "User-provided ids: {ids}"
   let splitPost : Bool :=
     let args := asArgs.getArgs
-    (args.get! 3).getArgs.size > 0
+    args.size > 3 ∧ (args.get! 3).getArgs.size > 0
   trace[Progress] "Split post: {splitPost}"
   /- For scalarTac we have a fast track: if the goal is not a linear
      arithmetic goal, we skip (note that otherwise, scalarTac would try
-- 
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