See if I can get the full error message from spring

features/support/rails_template

@@ -2,4 +2,4 @@ if Rails.gem_version < Gem::Version.new('6')
   gsub_file "Gemfile", /^gem 'sqlite3'$/, 'gem "sqlite3", "~> 1.3.6"'
 end
 
-gsub_file "Gemfile", /^ gem 'spring'$/, ' gem "spring", "!= 2.1.1"'
+gsub_file "Gemfile", /gem 'spring'$/, 'gem "spring", github: "composerinteralia/spring", branch: "factory_bot_rails_debugging"'

gemfiles/rails6.1.gemfile

@@ -1,6 +1,7 @@
 # This file was generated by Appraisal
 
 source "https://rubygems.org"
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 gem "appraisal"
 gem "aruba"
@@ -12,7 +13,7 @@ gem "byebug"
 gem "listen", "~> 3.2"
 gem "puma", "~> 5.0"
 gem "rails", "~> 6.1.0", ">= 6.1.0.0"
-gem "spring", "!= 2.1.1"
+gem "spring", github: "composerinteralia/spring", branch: "factory_bot_rails_debugging"
 gem "spring-watcher-listen", "~> 2.0.0"
 gem "sqlite3", "~> 1.4"
 

gemfiles/rails6.1.gemfile.lock

@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/composerinteralia/spring.git
+  revision: 6922516237d39b1c82a5a651a948ae535a0c22f6
+  branch: factory_bot_rails_debugging
+  specs:
+    spring (2.1.0)
+
 PATH
   remote: ..
   specs:
@@ -218,7 +225,6 @@ GEM
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.11.0)
-    spring (2.1.0)
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
@@ -258,7 +264,7 @@ DEPENDENCIES
   rails (~> 6.1.0, >= 6.1.0.0)
   rake
   rspec-rails
-  spring (!= 2.1.1)
+  spring!
   spring-watcher-listen (~> 2.0.0)
   sqlite3 (~> 1.4)
   standard