Remove `debug` target from `travis_config.rb`.
MODIFY
travis_config.rb
travis_config.rb
-MRuby::Build.new('debug') do |conf|
- toolchain :gcc
- enable_debug
-
- # include all core GEMs
- conf.gembox 'full-core'
- conf.cc.flags += %w(-Werror=declaration-after-statement)
- conf.compilers.each do |c|
- c.defines += %w(MRB_GC_STRESS MRB_GC_FIXED_ARENA MRB_METHOD_CACHE)
- end
-
- build_mrbc_exec
-end
-
MRuby::Build.new('full-debug') do |conf|
toolchain :gcc
enable_debug

Remove `debug` target from `travis_config.rb`.