From 1b94a289b1690c5f0bbfa7fe072d23170980f7b9 Mon Sep 17 00:00:00 2001
From: Lukasz Samson <lukaszsamson@gmail.com>
Date: Fri, 8 Jan 2021 22:03:58 +0100
Subject: [PATCH] rescue MatchError in :int calls

Fixes #455
---
 .../elixir_ls_debugger/lib/debugger/server.ex | 21 ++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/apps/elixir_ls_debugger/lib/debugger/server.ex b/apps/elixir_ls_debugger/lib/debugger/server.ex
index d55828696..b08307490 100644
--- a/apps/elixir_ls_debugger/lib/debugger/server.ex
+++ b/apps/elixir_ls_debugger/lib/debugger/server.ex
@@ -341,7 +341,12 @@ defmodule ElixirLS.Debugger.Server do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.next(pid)
+    try do
+      :int.next(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.next failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end
 
@@ -349,7 +354,12 @@ defmodule ElixirLS.Debugger.Server do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.step(pid)
+    try do
+      :int.step(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.step failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end
 
@@ -357,7 +367,12 @@ defmodule ElixirLS.Debugger.Server do
     pid = state.threads[thread_id]
     state = remove_paused_process(state, pid)
 
-    :int.finish(pid)
+    try do
+      :int.finish(pid)
+    rescue
+      e in MatchError ->
+        IO.warn ":int.finish failed, #{Exception.message(e)}"
+    end
     {%{}, state}
   end