diff --git a/.gitignore b/.gitignore
index c1371974..54802ca4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 .cargo
 .config
 .mal-history
+.mal_history
 .crystal
 .lein
 .m2
@@ -12,138 +13,10 @@
 .npm
 .node-gyp
 package-lock.json
-.elm
 */experiments
-*/node_modules
-*.o
-*.pyc
-*/step0_repl
-*/step1_read_print
-*/step2_eval
-*/step3_env
-*/step4_if_fn_do
-*/step5_tco
-*/step6_file
-*/step7_quote
-*/step8_macros
-*/step9_try
-*/stepA_mal
-*/mal
+node_modules
 */notes
 
 logs
 old
-
-ada/obj/
-awk/mal.awk
-bash/mal.sh
-clojure/mal.jar
-clojure/target
-clojure/.lein-repl-history
-coffee/mal.coffee
-cs/*.exe
-cs/*.dll
-cs/*.mdb
-d/*.o
-elixir/_build
-elixir/deps
-elixir/erl_crash.dump
-elixir/*.ez
-erlang/ebin
-erlang/.rebar
-erlang/src/*.beam
-es6/mal.js
-es6/.esm-cache
-factor/mal.factor
-fantom/lib
-forth/mal.fs
-fsharp/*.exe
-fsharp/*.dll
-fsharp/*.mdb
-go/step*
-groovy/*.class
-groovy/mal.jar
-haskell/*.hi
-haskell/*.o
-haxe/*.n
-haxe/*.py
-haxe/cpp/
-haxe/*.js
-java/mal.jar
-java/target/
-java/dependency-reduced-pom.xml
-.npm/
-.node-gyp/
-js/mal.js
-js/web/mal.js
-kotlin/*.jar
-kotlin/.idea
-kotlin/*.iml
-lua/lib
-lua/linenoise.so
-lua/mal.lua
-make/mal.mk
-mal/mal.mal
-matlab/octave-workspace
-miniMAL/mal.json
-nim/nimcache*
-objc/*.d
-ocaml/*.cmi
-ocaml/*.cmo
-ocaml/*.swp
-ocaml/*.cmx
-ocaml/*.o
-ocaml/mal_lib.*
-objpascal/*.o
-objpascal/*.ppu
-objpascal/pas-readline
-objpascal/regexpr/Source/RegExpr.ppu
-perl/mal.pl
-perl6/.precomp/
-php/mal.php
-php/mal-web.php
-ps/mal.ps
-python/mal.pyz
-r/mal.r
-ruby/mal.rb
-.cargo/
-rust/target/
-rust/Cargo.lock
-rust/.cargo
-r/lib
-scala/mal.jar
-scala/target
-scala/project
-skew/*.js
-tcl/mal.tcl
-vb/*.exe
-vb/*.dll
-vimscript/mal.vim
-clisp/*.fas
-clisp/*.lib
-basic/step0_repl.bas
-basic/step1_read_print.bas
-basic/step2_eval.bas
-basic/step3_env.bas
-basic/step4_if_fn_do.bas
-basic/step5_tco.bas
-basic/step6_file.bas
-basic/step7_quote.bas
-basic/step8_macros.bas
-basic/step9_try.bas
-basic/stepA_mal.bas
-basic/*.prg
-common-lisp/*.fasl
-common-lisp/*.lib
-common-lisp/images/*
-common-lisp/hist/*
-livescript/*.js
-!livescript/node_readline.js
-livescript/node_modules
-elm/node_modules
-elm/elm-stuff
-elm/*.js
-!elm/node_readline.js
-!elm/bootstrap.js
-wasm/*.wat
-wasm/*.wasm
+tmp/
diff --git a/.travis_test.sh b/.travis_test.sh
index e9b48d43..3d1d1078 100755
--- a/.travis_test.sh
+++ b/.travis_test.sh
@@ -7,7 +7,7 @@ IMPL=${2}
 
 # Environment variable configuration
 BUILD_IMPL=${BUILD_IMPL:-${IMPL}}
-TEST_OPTS="${TEST_OPTS} --debug-file ../${ACTION}.err"
+TEST_OPTS="${TEST_OPTS} --debug-file ../../${ACTION}.err"
 
 if [ "${DO_SELF_HOST}" ]; then
     MAL_IMPL=${IMPL}
@@ -55,9 +55,9 @@ build)
     # rpython often fails on step9 in compute_vars_longevity
     # so build step9, then continue with the full build
     if [ "${BUILD_IMPL}" = "rpython" ]; then
-        ${MAKE} -C "${BUILD_IMPL}" step9_try || true
+        ${MAKE} -C "impls/${BUILD_IMPL}" step9_try || true
     fi
-    ${MAKE} -C ${BUILD_IMPL}
+    ${MAKE} -C "impls/${BUILD_IMPL}"
     ;;
 test|perf)
     [ "${ACTION}" = "perf" ] && STEP=
diff --git a/Makefile b/Makefile
index fbaaf6cc..77b11fc3 100644
--- a/Makefile
+++ b/Makefile
@@ -163,110 +163,110 @@ endif
 # Implementation specific utility functions
 #
 
-basic_STEP_TO_PROG_cbm    = basic/$($(1)).bas
-basic_STEP_TO_PROG_qbasic = basic/$($(1))
+basic_STEP_TO_PROG_cbm          = impls/basic/$($(1)).bas
+basic_STEP_TO_PROG_qbasic       = impls/basic/$($(1))
 
-clojure_STEP_TO_PROG_clj  = clojure/target/$($(1)).jar
-clojure_STEP_TO_PROG_cljs = clojure/src/mal/$($(1)).cljc
+clojure_STEP_TO_PROG_clj        = impls/clojure/target/$($(1)).jar
+clojure_STEP_TO_PROG_cljs       = impls/clojure/src/mal/$($(1)).cljc
 
-haxe_STEP_TO_PROG_neko   = haxe/$($(1)).n
-haxe_STEP_TO_PROG_python = haxe/$($(1)).py
-haxe_STEP_TO_PROG_cpp    = haxe/cpp/$($(1))
-haxe_STEP_TO_PROG_js     = haxe/$($(1)).js
+haxe_STEP_TO_PROG_neko          = impls/haxe/$($(1)).n
+haxe_STEP_TO_PROG_python        = impls/haxe/$($(1)).py
+haxe_STEP_TO_PROG_cpp           = impls/haxe/cpp/$($(1))
+haxe_STEP_TO_PROG_js            = impls/haxe/$($(1)).js
 
-scheme_STEP_TO_PROG_chibi       = scheme/$($(1)).scm
-scheme_STEP_TO_PROG_kawa        = scheme/out/$($(1)).class
-scheme_STEP_TO_PROG_gauche      = scheme/$($(1)).scm
-scheme_STEP_TO_PROG_chicken     = scheme/$($(1))
-scheme_STEP_TO_PROG_sagittarius = scheme/$($(1)).scm
-scheme_STEP_TO_PROG_cyclone     = scheme/$($(1))
-scheme_STEP_TO_PROG_foment      = scheme/$($(1)).scm
+scheme_STEP_TO_PROG_chibi       = impls/scheme/$($(1)).scm
+scheme_STEP_TO_PROG_kawa        = impls/scheme/out/$($(1)).class
+scheme_STEP_TO_PROG_gauche      = impls/scheme/$($(1)).scm
+scheme_STEP_TO_PROG_chicken     = impls/scheme/$($(1))
+scheme_STEP_TO_PROG_sagittarius = impls/scheme/$($(1)).scm
+scheme_STEP_TO_PROG_cyclone     = impls/scheme/$($(1))
+scheme_STEP_TO_PROG_foment      = impls/scheme/$($(1)).scm
 
 # Map of step (e.g. "step8") to executable file for that step
-ada_STEP_TO_PROG =     ada/$($(1))
-ada.2_STEP_TO_PROG =   ada.2/$($(1))
-awk_STEP_TO_PROG =     awk/$($(1)).awk
-bash_STEP_TO_PROG =    bash/$($(1)).sh
-basic_STEP_TO_PROG =   $(basic_STEP_TO_PROG_$(basic_MODE))
-bbc-basic_STEP_TO_PROG = bbc-basic/$($(1)).bas
-c_STEP_TO_PROG =       c/$($(1))
-chuck_STEP_TO_PROG =   chuck/$($(1)).ck
-clojure_STEP_TO_PROG = $(clojure_STEP_TO_PROG_$(clojure_MODE))
-coffee_STEP_TO_PROG =  coffee/$($(1)).coffee
-common-lisp_STEP_TO_PROG =  common-lisp/$($(1))
-cpp_STEP_TO_PROG =     cpp/$($(1))
-crystal_STEP_TO_PROG = crystal/$($(1))
-cs_STEP_TO_PROG =      cs/$($(1)).exe
-d_STEP_TO_PROG =       d/$($(1))
-dart_STEP_TO_PROG =    dart/$($(1)).dart
-elisp_STEP_TO_PROG =   elisp/$($(1)).el
-elixir_STEP_TO_PROG =  elixir/lib/mix/tasks/$($(1)).ex
-elm_STEP_TO_PROG =     elm/$($(1)).js
-erlang_STEP_TO_PROG =  erlang/$($(1))
-es6_STEP_TO_PROG =     es6/$($(1)).mjs
-factor_STEP_TO_PROG =  factor/$($(1))/$($(1)).factor
-fantom_STEP_TO_PROG =  fantom/lib/fan/$($(1)).pod
-forth_STEP_TO_PROG =   forth/$($(1)).fs
-fsharp_STEP_TO_PROG =  fsharp/$($(1)).exe
-go_STEP_TO_PROG =      go/$($(1))
-groovy_STEP_TO_PROG =  groovy/$($(1)).groovy
-gnu-smalltalk_STEP_TO_PROG = gnu-smalltalk/$($(1)).st
-guile_STEP_TO_PROG =   guile/$($(1)).scm
-haskell_STEP_TO_PROG = haskell/$($(1))
-haxe_STEP_TO_PROG =    $(haxe_STEP_TO_PROG_$(haxe_MODE))
-hy_STEP_TO_PROG =      hy/$($(1)).hy
-io_STEP_TO_PROG =      io/$($(1)).io
-java_STEP_TO_PROG =    java/target/classes/mal/$($(1)).class
-js_STEP_TO_PROG =      js/$($(1)).js
-jq_STEP_PROG =         jq/$($(1)).jq
-julia_STEP_TO_PROG =   julia/$($(1)).jl
-kotlin_STEP_TO_PROG =  kotlin/$($(1)).jar
-livescript_STEP_TO_PROG = livescript/$($(1)).js
-logo_STEP_TO_PROG =    logo/$($(1)).lg
-lua_STEP_TO_PROG =     lua/$($(1)).lua
-make_STEP_TO_PROG =    make/$($(1)).mk
-mal_STEP_TO_PROG =     mal/$($(1)).mal
-matlab_STEP_TO_PROG =  matlab/$($(1)).m
-miniMAL_STEP_TO_PROG = miniMAL/$($(1)).json
-nasm_STEP_TO_PROG =    nasm/$($(1))
-nim_STEP_TO_PROG =     nim/$($(1))
-objc_STEP_TO_PROG =    objc/$($(1))
-objpascal_STEP_TO_PROG = objpascal/$($(1))
-ocaml_STEP_TO_PROG =   ocaml/$($(1))
-perl_STEP_TO_PROG =    perl/$($(1)).pl
-perl6_STEP_TO_PROG =   perl6/$($(1)).pl
-php_STEP_TO_PROG =     php/$($(1)).php
-picolisp_STEP_TO_PROG = picolisp/$($(1)).l
-pike_STEP_TO_PROG =    pike/$($(1)).pike
-plpgsql_STEP_TO_PROG = plpgsql/$($(1)).sql
-plsql_STEP_TO_PROG =   plsql/$($(1)).sql
-powershell_STEP_TO_PROG =  powershell/$($(1)).ps1
-ps_STEP_TO_PROG =      ps/$($(1)).ps
-python_STEP_TO_PROG =  python/$($(1)).py
-python.2_STEP_TO_PROG = python.2/$($(1)).py
-r_STEP_TO_PROG =       r/$($(1)).r
-racket_STEP_TO_PROG =  racket/$($(1)).rkt
-rexx_STEP_TO_PROG =    rexx/$($(1)).rexxpp
-rpython_STEP_TO_PROG = rpython/$($(1))
-ruby_STEP_TO_PROG =    ruby/$($(1)).rb
-rust_STEP_TO_PROG =    rust/$($(1))
-scala_STEP_TO_PROG =   scala/target/scala-2.11/classes/$($(1)).class
-scheme_STEP_TO_PROG =  $(scheme_STEP_TO_PROG_$(scheme_MODE))
-skew_STEP_TO_PROG =    skew/$($(1)).js
-swift_STEP_TO_PROG =   swift/$($(1))
-swift3_STEP_TO_PROG =  swift3/$($(1))
-swift4_STEP_TO_PROG =  swift4/$($(1))
-swift5_STEP_TO_PROG =  swift5/$($(1))
-tcl_STEP_TO_PROG =     tcl/$($(1)).tcl
-ts_STEP_TO_PROG =      ts/$($(1)).js
-vala_STEP_TO_PROG =    vala/$($(1))
-vb_STEP_TO_PROG =      vb/$($(1)).exe
-vhdl_STEP_TO_PROG =    vhdl/$($(1))
-vimscript_STEP_TO_PROG = vimscript/$($(1)).vim
-wasm_STEP_TO_PROG =    wasm/$($(1)).$(if $(filter lucet,$(wasm_MODE)),so,wasm)
-wren_STEP_TO_PROG =    wren/$($(1)).wren
-yorick_STEP_TO_PROG =  yorick/$($(1)).i
-zig_STEP_TO_PROG =     zig/$($(1))
+ada_STEP_TO_PROG =           impls/ada/$($(1))
+ada.2_STEP_TO_PROG =         impls/ada.2/$($(1))
+awk_STEP_TO_PROG =           impls/awk/$($(1)).awk
+bash_STEP_TO_PROG =          impls/bash/$($(1)).sh
+basic_STEP_TO_PROG =         $(basic_STEP_TO_PROG_$(basic_MODE))
+bbc-basic_STEP_TO_PROG =     impls/bbc-basic/$($(1)).bas
+c_STEP_TO_PROG =             impls/c/$($(1))
+chuck_STEP_TO_PROG =         impls/chuck/$($(1)).ck
+clojure_STEP_TO_PROG =       $(clojure_STEP_TO_PROG_$(clojure_MODE))
+coffee_STEP_TO_PROG =        impls/coffee/$($(1)).coffee
+common-lisp_STEP_TO_PROG =   impls/common-lisp/$($(1))
+cpp_STEP_TO_PROG =           impls/cpp/$($(1))
+crystal_STEP_TO_PROG =       impls/crystal/$($(1))
+cs_STEP_TO_PROG =            impls/cs/$($(1)).exe
+d_STEP_TO_PROG =             impls/d/$($(1))
+dart_STEP_TO_PROG =          impls/dart/$($(1)).dart
+elisp_STEP_TO_PROG =         impls/elisp/$($(1)).el
+elixir_STEP_TO_PROG =        impls/elixir/lib/mix/tasks/$($(1)).ex
+elm_STEP_TO_PROG =           impls/elm/$($(1)).js
+erlang_STEP_TO_PROG =        impls/erlang/$($(1))
+es6_STEP_TO_PROG =           impls/es6/$($(1)).mjs
+factor_STEP_TO_PROG =        impls/factor/$($(1))/$($(1)).factor
+fantom_STEP_TO_PROG =        impls/fantom/lib/fan/$($(1)).pod
+forth_STEP_TO_PROG =         impls/forth/$($(1)).fs
+fsharp_STEP_TO_PROG =        impls/fsharp/$($(1)).exe
+go_STEP_TO_PROG =            impls/go/$($(1))
+groovy_STEP_TO_PROG =        impls/groovy/$($(1)).groovy
+gnu-smalltalk_STEP_TO_PROG = impls/gnu-smalltalk/$($(1)).st
+guile_STEP_TO_PROG =         impls/guile/$($(1)).scm
+haskell_STEP_TO_PROG =       impls/haskell/$($(1))
+haxe_STEP_TO_PROG =          $(haxe_STEP_TO_PROG_$(haxe_MODE))
+hy_STEP_TO_PROG =            impls/hy/$($(1)).hy
+io_STEP_TO_PROG =            impls/io/$($(1)).io
+java_STEP_TO_PROG =          impls/java/target/classes/mal/$($(1)).class
+js_STEP_TO_PROG =            impls/js/$($(1)).js
+jq_STEP_PROG =               impls/jq/$($(1)).jq
+julia_STEP_TO_PROG =         impls/julia/$($(1)).jl
+kotlin_STEP_TO_PROG =        impls/kotlin/$($(1)).jar
+livescript_STEP_TO_PROG =    impls/livescript/$($(1)).js
+logo_STEP_TO_PROG =          impls/logo/$($(1)).lg
+lua_STEP_TO_PROG =           impls/lua/$($(1)).lua
+make_STEP_TO_PROG =          impls/make/$($(1)).mk
+mal_STEP_TO_PROG =           impls/mal/$($(1)).mal
+matlab_STEP_TO_PROG =        impls/matlab/$($(1)).m
+miniMAL_STEP_TO_PROG =       impls/miniMAL/$($(1)).json
+nasm_STEP_TO_PROG =          impls/nasm/$($(1))
+nim_STEP_TO_PROG =           impls/nim/$($(1))
+objc_STEP_TO_PROG =          impls/objc/$($(1))
+objpascal_STEP_TO_PROG =     impls/objpascal/$($(1))
+ocaml_STEP_TO_PROG =         impls/ocaml/$($(1))
+perl_STEP_TO_PROG =          impls/perl/$($(1)).pl
+perl6_STEP_TO_PROG =         impls/perl6/$($(1)).pl
+php_STEP_TO_PROG =           impls/php/$($(1)).php
+picolisp_STEP_TO_PROG =      impls/picolisp/$($(1)).l
+pike_STEP_TO_PROG =          impls/pike/$($(1)).pike
+plpgsql_STEP_TO_PROG =       impls/plpgsql/$($(1)).sql
+plsql_STEP_TO_PROG =         impls/plsql/$($(1)).sql
+powershell_STEP_TO_PROG =    impls/powershell/$($(1)).ps1
+ps_STEP_TO_PROG =            impls/ps/$($(1)).ps
+python_STEP_TO_PROG =        impls/python/$($(1)).py
+python.2_STEP_TO_PROG =      impls/python.2/$($(1)).py
+r_STEP_TO_PROG =             impls/r/$($(1)).r
+racket_STEP_TO_PROG =        impls/racket/$($(1)).rkt
+rexx_STEP_TO_PROG =          impls/rexx/$($(1)).rexxpp
+rpython_STEP_TO_PROG =       impls/rpython/$($(1))
+ruby_STEP_TO_PROG =          impls/ruby/$($(1)).rb
+rust_STEP_TO_PROG =          impls/rust/$($(1))
+scala_STEP_TO_PROG =         impls/scala/target/scala-2.11/classes/$($(1)).class
+scheme_STEP_TO_PROG =        $(scheme_STEP_TO_PROG_$(scheme_MODE))
+skew_STEP_TO_PROG =          impls/skew/$($(1)).js
+swift_STEP_TO_PROG =         impls/swift/$($(1))
+swift3_STEP_TO_PROG =        impls/swift3/$($(1))
+swift4_STEP_TO_PROG =        impls/swift4/$($(1))
+swift5_STEP_TO_PROG =        impls/swift5/$($(1))
+tcl_STEP_TO_PROG =           impls/tcl/$($(1)).tcl
+ts_STEP_TO_PROG =            impls/ts/$($(1)).js
+vala_STEP_TO_PROG =          impls/vala/$($(1))
+vb_STEP_TO_PROG =            impls/vb/$($(1)).exe
+vhdl_STEP_TO_PROG =          impls/vhdl/$($(1))
+vimscript_STEP_TO_PROG =     impls/vimscript/$($(1)).vim
+wasm_STEP_TO_PROG =          impls/wasm/$($(1)).$(if $(filter lucet,$(wasm_MODE)),so,wasm)
+wren_STEP_TO_PROG =          impls/wren/$($(1)).wren
+yorick_STEP_TO_PROG =        impls/yorick/$($(1)).i
+zig_STEP_TO_PROG =           impls/zig/$($(1))
 
 #
 # General settings and utility functions
@@ -290,7 +290,7 @@ STEP_TEST_FILES = $(strip $(wildcard \
 			$(filter-out $(if $(filter $(1),$(step5_EXCLUDES)),step5,),\
 			  $(regress_$(2)))\
 			,$(2)),\
-		      $(1)/tests/$($(s))$(EXTENSION) tests/$($(s))$(EXTENSION))))
+		      impls/$(1)/tests/$($(s))$(EXTENSION) impls/tests/$($(s))$(EXTENSION))))
 
 # DOCKERIZE utility functions
 lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
@@ -307,13 +307,13 @@ get_build_command = $(strip $(foreach mode,$(1)_MODE, \
       docker run \
       -it --rm -u $(shell id -u) \
       -v $(dir $(abspath $(lastword $(MAKEFILE_LIST)))):/mal \
-      -w /mal/$(1) \
+      -w /mal/impls/$(1) \
       $(if $(strip $($(mode))),-e $(mode)=$($(mode)),) \
       $(if $(filter factor,$(1)),-e FACTOR_ROOTS=$(FACTOR_ROOTS),) \
       $(call impl_to_image,$(1)) \
       $(MAKE) $(if $(strip $($(mode))),$(mode)=$($(mode)),) \
       ,\
-      $(MAKE) $(if $(strip $($(mode))),$(mode)=$($(mode)),) -C $(impl))))
+      $(MAKE) $(if $(strip $($(mode))),$(mode)=$($(mode)),) -C impls/$(impl))))
 
 # Takes impl and step args. Optional env vars and dockerize args
 # Returns a command prefix (docker command and environment variables)
@@ -323,7 +323,7 @@ get_run_prefix = $(strip $(foreach mode,$(call actual_impl,$(1))_MODE, \
       docker run -e STEP=$($2) -e MAL_IMPL=$(MAL_IMPL) \
       -it --rm -u $(shell id -u) \
       -v $(dir $(abspath $(lastword $(MAKEFILE_LIST)))):/mal \
-      -w /mal/$(call actual_impl,$(1)) \
+      -w /mal/impls/$(call actual_impl,$(1)) \
       $(if $(strip $($(mode))),-e $(mode)=$($(mode)),) \
       $(if $(filter factor,$(1)),-e FACTOR_ROOTS=$(FACTOR_ROOTS),) \
       $(foreach env,$(3),-e $(env)) \
@@ -337,11 +337,11 @@ get_run_prefix = $(strip $(foreach mode,$(call actual_impl,$(1))_MODE, \
 # Takes impl and step
 # Returns the runtest command prefix (with runtest options) for testing the given step
 get_runtest_cmd = $(call get_run_prefix,$(1),$(2),$(if $(filter cs fsharp mal tcl vb,$(1)),RAW=1,)) \
-		    ../runtest.py $(opt_HARD) $(opt_DEFERRABLE) $(opt_OPTIONAL) $(call $(1)_TEST_OPTS) $(TEST_OPTS)
+		    ../../runtest.py $(opt_HARD) $(opt_DEFERRABLE) $(opt_OPTIONAL) $(call $(1)_TEST_OPTS) $(TEST_OPTS)
 
 # Takes impl and step
 # Returns the runtest command prefix (with runtest options) for testing the given step
-get_argvtest_cmd = $(call get_run_prefix,$(1),$(2)) ../run_argv_test.sh
+get_argvtest_cmd = $(call get_run_prefix,$(1),$(2)) ../tests/run_argv_test.sh
 
 # Derived lists
 STEPS = $(sort $(filter-out %_EXCLUDES,$(filter step%,$(.VARIABLES))))
@@ -382,10 +382,10 @@ ALL_REPL = $(strip $(sort \
 # encoded in the implementation Makefile not here
 .PHONY: $(foreach i,$(DO_IMPLS),$(foreach s,$(STEPS),$(call $(i)_STEP_TO_PROG,$(s))))
 $(foreach i,$(DO_IMPLS),$(foreach s,$(STEPS),$(call $(i)_STEP_TO_PROG,$(s)))):
-	$(foreach impl,$(word 1,$(subst /, ,$(@))),\
+	$(foreach impl,$(word 2,$(subst /, ,$(@))),\
 	  $(if $(DOCKERIZE), \
-	    $(call get_build_command,$(impl)) $(patsubst $(impl)/%,%,$(@)), \
-	    $(call get_build_command,$(impl)) $(subst $(impl)/,,$(@))))
+	    $(call get_build_command,$(impl)) $(patsubst impls/$(impl)/%,%,$(@)), \
+	    $(call get_build_command,$(impl)) $(subst impls/$(impl)/,,$(@))))
 
 # Allow IMPL, build^IMPL, IMPL^STEP, and build^IMPL^STEP
 $(DO_IMPLS): $$(foreach s,$$(STEPS),$$(call $$(@)_STEP_TO_PROG,$$(s)))
@@ -405,8 +405,9 @@ $(foreach i,$(DO_IMPLS),$(foreach s,$(STEPS),build^$(i)^$(s))): $$(call $$(word
 $(ALL_TESTS): $$(call $$(word 2,$$(subst ^, ,$$(@)))_STEP_TO_PROG,$$(word 3,$$(subst ^, ,$$(@))))
 	@$(foreach impl,$(word 2,$(subst ^, ,$(@))),\
 	  $(foreach step,$(word 3,$(subst ^, ,$(@))),\
-	    cd $(call actual_impl,$(impl)) && \
-	    $(foreach test,$(call STEP_TEST_FILES,$(impl),$(step)),\
+	    echo "(call STEP_TEST_FILES,$(impl),$(step)): $(call STEP_TEST_FILES,$(impl),$(step))" && \
+	    cd impls/$(call actual_impl,$(impl)) && \
+	    $(foreach test,$(patsubst impls/%,%,$(call STEP_TEST_FILES,$(impl),$(step))),\
 	      echo '----------------------------------------------' && \
 	      echo 'Testing $@; step file: $+, test file: $(test)' && \
 	      echo 'Running: $(call get_runtest_cmd,$(impl),$(step)) ../$(test) -- ../$(impl)/run' && \
@@ -438,7 +439,7 @@ $(DOCKER_BUILD):
 	@echo "----------------------------------------------"; \
 	$(foreach impl,$(word 2,$(subst ^, ,$(@))),\
 	  echo "Running: docker build -t $(call impl_to_image,$(impl)) .:"; \
-	  cd $(impl) && docker build -t $(call impl_to_image,$(impl)) .)
+	  cd impls/$(impl) && docker build -t $(call impl_to_image,$(impl)) .)
 
 #
 # Docker shell rules
@@ -460,7 +461,7 @@ perf: $(IMPL_PERF)
 $(IMPL_PERF):
 	@echo "----------------------------------------------"; \
 	$(foreach impl,$(word 2,$(subst ^, ,$(@))),\
-	  cd $(call actual_impl,$(impl)); \
+	  cd impls/$(call actual_impl,$(impl)); \
 	  echo "Performance test for $(impl):"; \
 	  echo 'Running: $(call get_run_prefix,$(impl),stepA) ../$(impl)/run ../tests/perf1.mal'; \
 	  $(call get_run_prefix,$(impl),stepA) ../$(impl)/run ../tests/perf1.mal; \
@@ -477,7 +478,7 @@ $(IMPL_PERF):
 $(ALL_REPL): $$(call $$(word 2,$$(subst ^, ,$$(@)))_STEP_TO_PROG,$$(word 3,$$(subst ^, ,$$(@))))
 	@$(foreach impl,$(word 2,$(subst ^, ,$(@))),\
 	  $(foreach step,$(word 3,$(subst ^, ,$(@))),\
-	    cd $(call actual_impl,$(impl)); \
+	    cd impls/$(call actual_impl,$(impl)); \
 	    echo 'REPL implementation $(impl), step file: $+'; \
 	    echo 'Running: $(call get_run_prefix,$(impl),$(step)) ../$(impl)/run $(RUN_ARGS)'; \
 	    $(call get_run_prefix,$(impl),$(step)) ../$(impl)/run $(RUN_ARGS);))
@@ -496,7 +497,7 @@ stats: $(IMPL_STATS)
 $(IMPL_STATS):
 	@$(foreach impl,$(word 2,$(subst ^, ,$(@))),\
 	  echo "Stats for $(impl):"; \
-	  $(LOCCOUNT) -x "[sS]tep[0-9]_.*|[.]md$$|tests|examples|Makefile|package.json|tsconfig.json|Cargo.toml|project.clj|node_modules|getline.cs|terminal.cs|elm-stuff|objpascal/regexpr|rdyncall|swift/templates" $(impl))
+	  $(LOCCOUNT) -x "[sS]tep[0-9]_.*|[.]md$$|tests|examples|Makefile|package.json|tsconfig.json|Cargo.toml|project.clj|node_modules|getline.cs|terminal.cs|elm-stuff|objpascal/regexpr|rdyncall|swift/templates" impls/$(impl))
 
 #
 # Utility functions
diff --git a/README.md b/README.md
index 6d1ed384..470489ca 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,42 @@
 
 **1. Mal is a Clojure inspired Lisp interpreter**
 
-**2. Mal is implemented in 81 languages (84 different implementations and 104 runtime modes)**
+**2. Mal is a learning tool**
+
+Each implementation of mal is separated into
+11 incremental, self-contained (and testable) steps that demonstrate
+core concepts of Lisp. The last step is capable of self-hosting
+(running the mal implementation of mal). See the [make-a-lisp process
+guide](process/guide.md). 
+
+The make-a-lisp steps are:
+
+* [step0_repl](process/guide.md#step0)
+* [step1_read_print](process/guide.md#step1)
+* [step2_eval](process/guide.md#step2)
+* [step3_env](process/guide.md#step3)
+* [step4_if_fn_do](process/guide.md#step4)
+* [step5_tco](process/guide.md#step5)
+* [step6_file](process/guide.md#step6)
+* [step7_quote](process/guide.md#step7)
+* [step8_macros](process/guide.md#step8)
+* [step9_try](process/guide.md#step9)
+* [stepA_mal](process/guide.md#stepA)
+
+Each make-a-lisp step has an associated architectural diagram. That elements
+that are new for that step are highlighted in red.
+Here is the final diagram for [step A](process/guide.md#stepA):
+
+![stepA_mal architecture](process/stepA_mal.png)
+
+If you are interested in creating a mal implementation (or just
+interested in using mal for something), please drop by the #mal
+channel on freenode. In addition to the [make-a-lisp process
+guide](process/guide.md) there is also a [mal/make-a-lisp
+FAQ](docs/FAQ.md) where I attempt to answer some common questions.
+
+
+**3. Mal is implemented in 81 languages (84 different implementations and 104 runtime modes)**
 
 | Language | Creator |
 | -------- | ------- |
@@ -96,41 +131,6 @@
 | [Zig](#zig) | [Josh Tobin](https://github.com/rjtobin) |
 
 
-**3. Mal is a learning tool**
-
-Each implementation of mal is separated into
-11 incremental, self-contained (and testable) steps that demonstrate
-core concepts of Lisp. The last step is capable of self-hosting
-(running the mal implementation of mal). See the [make-a-lisp process
-guide](process/guide.md). 
-
-The make-a-lisp steps are:
-
-* [step0_repl](process/guide.md#step0)
-* [step1_read_print](process/guide.md#step1)
-* [step2_eval](process/guide.md#step2)
-* [step3_env](process/guide.md#step3)
-* [step4_if_fn_do](process/guide.md#step4)
-* [step5_tco](process/guide.md#step5)
-* [step6_file](process/guide.md#step6)
-* [step7_quote](process/guide.md#step7)
-* [step8_macros](process/guide.md#step8)
-* [step9_try](process/guide.md#step9)
-* [stepA_mal](process/guide.md#stepA)
-
-Each make-a-lisp step has an associated architectural diagram. That elements
-that are new for that step are highlighted in red.
-Here is the final diagram for [step A](process/guide.md#stepA):
-
-![stepA_mal architecture](process/stepA_mal.png)
-
-If you are interested in creating a mal implementation (or just
-interested in using mal for something), please drop by the #mal
-channel on freenode. In addition to the [make-a-lisp process
-guide](process/guide.md) there is also a [mal/make-a-lisp
-FAQ](docs/FAQ.md) where I attempt to answer some common questions.
-
-
 ## Presentations
 
 Mal was presented publicly for the first time in a lightning talk at
@@ -197,7 +197,7 @@ GNAT and (optionally) make.  There are no external dependencies
 (readline not implemented).
 
 ```
-cd ada
+cd impls/ada
 make
 ./stepX_YYY
 ```
@@ -208,7 +208,7 @@ The second Ada implementation was developed with GNAT 8 and links with
 the GNU readline library.
 
 ```
-cd ada
+cd impls/ada
 make
 ./stepX_YYY
 ```
@@ -218,14 +218,14 @@ make
 The GNU awk implementation of mal has been tested with GNU awk 4.1.1.
 
 ```
-cd gawk
+cd impls/gawk
 gawk -O -f stepX_YYY.awk
 ```
 
 ### Bash 4
 
 ```
-cd bash
+cd impls/bash
 bash stepX_YYY.sh
 ```
 
@@ -241,7 +241,7 @@ has been tested with [qb64](http://www.qb64.net/).
 Generate C64 code and run it using cbmbasic:
 
 ```
-cd basic
+cd impls/basic
 make stepX_YYY.bas
 STEP=stepX_YYY ./run
 ```
@@ -249,7 +249,7 @@ STEP=stepX_YYY ./run
 Generate QBasic code and load it into qb64:
 
 ```
-cd basic
+cd impls/basic
 make MODE=qbasic stepX_YYY.bas
 ./qb64 stepX_YYY.bas
 ```
@@ -262,7 +262,7 @@ inspiration for this implementation.
 The BBC BASIC V implementation can run in the Brandy interpreter:
 
 ```
-cd bbc-basic
+cd impls/bbc-basic
 brandy -quit stepX_YYY.bbc
 ```
 
@@ -281,7 +281,7 @@ header packages): glib, libffi6, libgc, and either the libedit or GNU readline
 library.
 
 ```
-cd c
+cd impls/c
 make
 ./stepX_YYY
 ```
@@ -293,7 +293,7 @@ a readline compatible library to build. See the `cpp/README.md` for
 more details:
 
 ```
-cd cpp
+cd impls/cpp
 make
     # OR
 make CXX=clang++-3.5
@@ -308,7 +308,7 @@ C# compiler (mcs) and the Mono runtime (version 2.10.8.1). Both are
 required to build and run the C# implementation.
 
 ```
-cd cs
+cd impls/cs
 make
 mono ./stepX_YYY.exe
 ```
@@ -318,7 +318,7 @@ mono ./stepX_YYY.exe
 The ChucK implementation has been tested with ChucK 1.3.5.2.
 
 ```
-cd chuck
+cd impls/chuck
 ./run
 ```
 
@@ -328,7 +328,7 @@ For the most part the Clojure implementation requires Clojure 1.5,
 however, to pass all tests, Clojure 1.8.0-RC4 is required.
 
 ```
-cd clojure
+cd impls/clojure
 lein with-profile +stepX trampoline run
 ```
 
@@ -336,7 +336,7 @@ lein with-profile +stepX trampoline run
 
 ```
 sudo npm install -g coffee-script
-cd coffee
+cd impls/coffee
 coffee ./stepX_YYY
 ```
 
@@ -348,7 +348,7 @@ the [README](common-lisp/README.org) for more details. Provided you have the
 dependencies mentioned installed, do the following to run the implementation
 
 ```
-cd common-lisp
+cd impls/common-lisp
 make
 ./run
 ```
@@ -358,7 +358,7 @@ make
 The Crystal implementation of mal has been tested with Crystal 0.26.1.
 
 ```
-cd crystal
+cd impls/crystal
 crystal run ./stepX_YYY.cr
     # OR
 make   # needed to run tests
@@ -371,7 +371,7 @@ The D implementation of mal was tested with GDC 4.8.  It requires the GNU
 readline library.
 
 ```
-cd d
+cd impls/d
 make
 ./stepX_YYY
 ```
@@ -381,7 +381,7 @@ make
 The Dart implementation has been tested with Dart 1.20.
 
 ```
-cd dart
+cd impls/dart
 dart ./stepX_YYY
 ```
 
@@ -393,7 +393,7 @@ and `C-d` work, `C-c` cancels the process), it is recommended to use
 `rlwrap`.
 
 ```
-cd elisp
+cd impls/elisp
 emacs -Q --batch --load stepX_YYY.el
 # with full readline support
 rlwrap emacs -Q --batch --load stepX_YYY.el
@@ -404,7 +404,7 @@ rlwrap emacs -Q --batch --load stepX_YYY.el
 The Elixir implementation of mal has been tested with Elixir 1.0.5.
 
 ```
-cd elixir
+cd impls/elixir
 mix stepX_YYY
 # Or with readline/line editing functionality:
 iex -S mix stepX_YYY
@@ -415,7 +415,7 @@ iex -S mix stepX_YYY
 The Elm implementation of mal has been tested with Elm 0.18.0
 
 ```
-cd elm
+cd impls/elm
 make stepX_YYY.js
 STEP=stepX_YYY ./run
 ```
@@ -426,7 +426,7 @@ The Erlang implementation of mal requires [Erlang/OTP R17](http://www.erlang.org
 and [rebar](https://github.com/rebar/rebar) to build.
 
 ```
-cd erlang
+cd impls/erlang
 make
     # OR
 MAL_STEP=stepX_YYY rebar compile escriptize # build individual step
@@ -440,7 +440,7 @@ The ES6 / ECMAScript 2015 implementation uses the
 JavaScript. The generated code has been tested with Node 0.12.4.
 
 ```
-cd es6
+cd impls/es6
 make
 node build/stepX_YYY.js
 ```
@@ -454,7 +454,7 @@ compiler (mcs) is also necessary to compile the readline dependency. All are
 required to build and run the F# implementation.
 
 ```
-cd fsharp
+cd impls/fsharp
 make
 mono ./stepX_YYY.exe
 ```
@@ -465,7 +465,7 @@ The Factor implementation of mal has been tested with Factor 0.97
 ([factorcode.org](http://factorcode.org)).
 
 ```
-cd factor
+cd impls/factor
 FACTOR_ROOTS=. factor -run=stepX_YYY
 ```
 
@@ -474,7 +474,7 @@ FACTOR_ROOTS=. factor -run=stepX_YYY
 The Fantom implementation of mal has been tested with Fantom 1.0.70.
 
 ```
-cd fantom
+cd impls/fantom
 make lib/fan/stepX_YYY.pod
 STEP=stepX_YYY ./run
 ```
@@ -482,14 +482,14 @@ STEP=stepX_YYY ./run
 ### Forth
 
 ```
-cd forth
+cd impls/forth
 gforth stepX_YYY.fs
 ```
 
 ### GNU Guile 2.1+
 
 ```
-cd guile
+cd impls/guile
 guile -L ./ stepX_YYY.scm
 ```
 
@@ -498,7 +498,7 @@ guile -L ./ stepX_YYY.scm
 The Smalltalk implementation of mal has been tested with GNU Smalltalk 3.2.91.
 
 ```
-cd gnu-smalltalk
+cd impls/gnu-smalltalk
 ./run
 ```
 
@@ -508,7 +508,7 @@ The Go implementation of mal requires that go is installed on on the
 path. The implementation has been tested with Go 1.3.1.
 
 ```
-cd go
+cd impls/go
 make
 ./stepX_YYY
 ```
@@ -520,7 +520,7 @@ The Groovy implementation of mal requires Groovy to run and has been
 tested with Groovy 1.8.6.
 
 ```
-cd groovy
+cd impls/groovy
 make
 groovy ./stepX_YYY.groovy
 ```
@@ -531,7 +531,7 @@ The Haskell implementation requires the ghc compiler version 7.10.1 or
 later and also the Haskell parsec and readline (or editline) packages.
 
 ```
-cd haskell
+cd impls/haskell
 make
 ./stepX_YYY
 ```
@@ -543,7 +543,7 @@ Four different Haxe targets are supported: Neko, Python, C++, and
 JavaScript.
 
 ```
-cd haxe
+cd impls/haxe
 # Neko
 make all-neko
 neko ./stepX_YYY.n
@@ -563,7 +563,7 @@ node ./stepX_YYY.js
 The Hy implementation of mal has been tested with Hy 0.13.0.
 
 ```
-cd hy
+cd impls/hy
 ./stepX_YYY.hy
 ```
 
@@ -572,7 +572,7 @@ cd hy
 The Io implementation of mal has been tested with Io version 20110905.
 
 ```
-cd io
+cd impls/io
 io ./stepX_YYY.io
 ```
 
@@ -581,7 +581,7 @@ io ./stepX_YYY.io
 The Java implementation of mal requires maven2 to build.
 
 ```
-cd java
+cd impls/java
 mvn compile
 mvn -quiet exec:java -Dexec.mainClass=mal.stepX_YYY
     # OR
@@ -591,7 +591,7 @@ mvn -quiet exec:java -Dexec.mainClass=mal.stepX_YYY -Dexec.args="CMDLINE_ARGS"
 ### JavaScript/Node
 
 ```
-cd js
+cd impls/js
 npm install
 node stepX_YYY.js
 ```
@@ -601,7 +601,7 @@ node stepX_YYY.js
 The Julia implementation of mal requires Julia 0.4.
 
 ```
-cd julia
+cd impls/julia
 julia stepX_YYY.jl
 ```
 
@@ -610,7 +610,7 @@ julia stepX_YYY.jl
 Tested against version 1.6, with a lot of cheating in the IO department
 
 ```
-cd jq
+cd impls/jq
 STEP=stepA_YYY ./run
     # with Debug
 DEBUG=true STEP=stepA_YYY ./run
@@ -621,7 +621,7 @@ DEBUG=true STEP=stepA_YYY ./run
 The Kotlin implementation of mal has been tested with Kotlin 1.0.
 
 ```
-cd kotlin
+cd impls/kotlin
 make
 java -jar stepX_YYY.jar
 ```
@@ -631,7 +631,7 @@ java -jar stepX_YYY.jar
 The LiveScript implementation of mal has been tested with LiveScript 1.5.
 
 ```
-cd livescript
+cd impls/livescript
 make
 node_modules/.bin/lsc stepX_YYY.ls
 ```
@@ -641,7 +641,7 @@ node_modules/.bin/lsc stepX_YYY.ls
 The Logo implementation of mal has been tested with UCBLogo 6.0.
 
 ```
-cd logo
+cd impls/logo
 logo stepX_YYY.lg
 ```
 
@@ -652,7 +652,7 @@ implementation requires that luarocks and the lua-rex-pcre library
 are installed.
 
 ```
-cd lua
+cd impls/lua
 make  # to build and link linenoise.so
 ./stepX_YYY.lua
 ```
@@ -664,7 +664,7 @@ the other implementations and passing the mal step to run as a command
 line argument.
 
 ```
-cd IMPL
+cd impls/IMPL
 IMPL_STEPA_CMD ../mal/stepX_YYY.mal
 
 ```
@@ -672,7 +672,7 @@ IMPL_STEPA_CMD ../mal/stepX_YYY.mal
 ### GNU Make 3.81
 
 ```
-cd make
+cd impls/make
 make -f stepX_YYY.mk
 ```
 
@@ -682,7 +682,7 @@ The NASM implementation of mal is written for x86-64 Linux, and has been tested
 with Linux 3.16.0-4-amd64 and NASM version 2.11.05.
 
 ```
-cd nasm
+cd impls/nasm
 make
 ./stepX_YYY
 ```
@@ -692,7 +692,7 @@ make
 The Nim implementation of mal has been tested with Nim 1.0.4.
 
 ```
-cd nim
+cd impls/nim
 make
   # OR
 nimble build
@@ -705,7 +705,7 @@ The Object Pascal implementation of mal has been built and tested on
 Linux using the Free Pascal compiler version 2.6.2 and 2.6.4.
 
 ```
-cd objpascal
+cd impls/objpascal
 make
 ./stepX_YYY
 ```
@@ -717,7 +717,7 @@ Linux using clang/LLVM 3.6. It has also been built and tested on OS
 X using XCode 7.
 
 ```
-cd objc
+cd impls/objc
 make
 ./stepX_YYY
 ```
@@ -725,7 +725,7 @@ make
 ### OCaml 4.01.0
 
 ```
-cd ocaml
+cd impls/ocaml
 make
 ./stepX_YYY
 ```
@@ -737,7 +737,7 @@ It has also been tested with MATLAB version R2014a on Linux. Note that
 MATLAB is a commercial product.
 
 ```
-cd matlab
+cd impls/matlab
 ./stepX_YYY
 octave -q --no-gui --no-history --eval "stepX_YYY();quit;"
 matlab -nodisplay -nosplash -nodesktop -nojvm -r "stepX_YYY();quit;"
@@ -753,7 +753,7 @@ implemented in less than 1024 bytes of JavaScript. To run the miniMAL
 implementation of mal you need to download/install the miniMAL
 interpreter (which requires Node.js).
 ```
-cd miniMAL
+cd impls/miniMAL
 # Download miniMAL and dependencies
 npm install
 export PATH=`pwd`/node_modules/minimal-lisp/:$PATH
@@ -769,7 +769,7 @@ For readline line editing support, install Term::ReadLine::Perl or
 Term::ReadLine::Gnu from CPAN.
 
 ```
-cd perl
+cd impls/perl
 perl stepX_YYY.pl
 ```
 
@@ -778,7 +778,7 @@ perl stepX_YYY.pl
 The Perl 6 implementation was tested on Rakudo Perl 6 2016.04.
 
 ```
-cd perl6
+cd impls/perl6
 perl6 stepX_YYY.pl
 ```
 
@@ -788,7 +788,7 @@ The PHP implementation of mal requires the php command line interface
 to run.
 
 ```
-cd php
+cd impls/php
 php stepX_YYY.php
 ```
 
@@ -798,7 +798,7 @@ The Picolisp implementation requires libreadline and Picolisp 3.1.11
 or later.
 
 ```
-cd picolisp
+cd impls/picolisp
 ./run
 ```
 
@@ -807,7 +807,7 @@ cd picolisp
 The Pike implementation was tested on Pike 8.0.
 
 ```
-cd pike
+cd impls/pike
 pike stepX_YYY.pike
 ```
 
@@ -824,7 +824,7 @@ using the PGPASSWORD environment variable. The implementation has been
 tested with PostgreSQL 9.4.
 
 ```
-cd plpgsql
+cd impls/plpgsql
 ./wrap.sh stepX_YYY.sql
     # OR
 PSQL_USER=myuser PGPASSWORD=mypass ./wrap.sh stepX_YYY.sql
@@ -844,7 +844,7 @@ warnings (user password expiration, etc) will interfere with the
 ability of the wrapper script to communicate with the DB.
 
 ```
-cd plsql
+cd impls/plsql
 ./wrap.sh stepX_YYY.sql
     # OR
 ORACLE_LOGON=myuser/mypass@ORCL ./wrap.sh stepX_YYY.sql
@@ -856,7 +856,7 @@ The PostScript implementation of mal requires Ghostscript to run. It
 has been tested with Ghostscript 9.10.
 
 ```
-cd ps
+cd impls/ps
 gs -q -dNODISPLAY -I./ stepX_YYY.ps
 ```
 
@@ -866,14 +866,14 @@ The PowerShell implementation of mal requires the PowerShell script
 language. It has been tested with PowerShell 6.0.0 Alpha 9 on Linux.
 
 ```
-cd powershell
+cd impls/powershell
 powershell ./stepX_YYY.ps1
 ```
 
 ### Python (2.X and 3.X)
 
 ```
-cd python
+cd impls/python
 python stepX_YYY.py
 ```
 
@@ -893,7 +893,7 @@ You must have [rpython](https://rpython.readthedocs.org/) on your path
 (included with [pypy](https://bitbucket.org/pypy/pypy/)).
 
 ```
-cd rpython
+cd impls/rpython
 make        # this takes a very long time
 ./stepX_YYY
 ```
@@ -903,7 +903,7 @@ make        # this takes a very long time
 The R implementation of mal requires R (r-base-core) to run.
 
 ```
-cd r
+cd impls/r
 make libs  # to download and build rdyncall
 Rscript stepX_YYY.r
 ```
@@ -914,7 +914,7 @@ The Racket implementation of mal requires the Racket
 compiler/interpreter to run.
 
 ```
-cd racket
+cd impls/racket
 ./stepX_YYY.rkt
 ```
 
@@ -923,7 +923,7 @@ cd racket
 The Rexx implementation of mal has been tested with Regina Rexx 3.6.
 
 ```
-cd rexx
+cd impls/rexx
 make
 rexx -a ./stepX_YYY.rexxpp
 ```
@@ -931,7 +931,7 @@ rexx -a ./stepX_YYY.rexxpp
 ### Ruby (1.9+)
 
 ```
-cd ruby
+cd impls/ruby
 ruby stepX_YYY.rb
 ```
 
@@ -941,7 +941,7 @@ The rust implementation of mal requires the rust compiler and build
 tool (cargo) to build.
 
 ```
-cd rust
+cd impls/rust
 cargo run --release --bin stepX_YYY
 ```
 
@@ -950,7 +950,7 @@ cargo run --release --bin stepX_YYY
 Install scala and sbt (http://www.scala-sbt.org/0.13/tutorial/Installing-sbt-on-Linux.html):
 
 ```
-cd scala
+cd impls/scala
 sbt 'run-main stepX_YYY'
     # OR
 sbt compile
@@ -967,7 +967,7 @@ after figuring out how libraries are loaded and adjusting the
 `Makefile` and `run` script accordingly.
 
 ```
-cd scheme
+cd impls/scheme
 make symlinks
 # chibi
 scheme_MODE=chibi ./run
@@ -993,7 +993,7 @@ scheme_MODE=foment ./run
 The Skew implementation of mal has been tested with Skew 0.7.42.
 
 ```
-cd skew
+cd impls/skew
 make
 node stepX_YYY.js
 ```
@@ -1006,7 +1006,7 @@ The Swift implementation of mal requires the Swift 2.0 compiler (XCode
 language and standard library.
 
 ```
-cd swift
+cd impls/swift
 make
 ./stepX_YYY
 ```
@@ -1017,7 +1017,7 @@ The Swift 3 implementation of mal requires the Swift 3.0 compiler. It
 has been tested with Swift 3 Preview 3.
 
 ```
-cd swift3
+cd impls/swift3
 make
 ./stepX_YYY
 ```
@@ -1028,7 +1028,7 @@ The Swift 4 implementation of mal requires the Swift 4.0 compiler. It
 has been tested with Swift 4.2.3 release.
 
 ```
-cd swift4
+cd impls/swift4
 make
 ./stepX_YYY
 ```
@@ -1039,7 +1039,7 @@ The Swift 5 implementation of mal requires the Swift 5.0 compiler. It
 has been tested with Swift 5.1.1 release.
 
 ```
-cd swift5
+cd impls/swift5
 swift run stepX_YYY
 ```
 
@@ -1049,7 +1049,7 @@ The Tcl implementation of mal requires Tcl 8.6 to run.  For readline line
 editing support, install tclreadline.
 
 ```
-cd tcl
+cd impls/tcl
 tclsh ./stepX_YYY.tcl
 ```
 
@@ -1059,7 +1059,7 @@ The TypeScript implementation of mal requires the TypeScript 2.2 compiler.
 It has been tested with Node.js v6.
 
 ```
-cd ts
+cd impls/ts
 make
 node ./stepX_YYY.js
 ```
@@ -1071,7 +1071,7 @@ compiler. You will need to install `valac` and `libreadline-dev` or
 equivalent.
 
 ```
-cd vala
+cd impls/vala
 make
 ./stepX_YYY
 ```
@@ -1081,7 +1081,7 @@ make
 The VHDL implementation of mal has been tested with GHDL 0.29.
 
 ```
-cd vhdl
+cd impls/vhdl
 make
 ./run_vhdl.sh ./stepX_YYY
 ```
@@ -1091,7 +1091,7 @@ make
 The Vimscript implementation of mal requires Vim 8.0 to run.
 
 ```
-cd vimscript
+cd impls/vimscript
 ./run_vimscript.sh ./stepX_YYY.vim
 ```
 
@@ -1102,7 +1102,7 @@ VB compiler (vbnc) and the Mono runtime (version 2.10.8.1). Both are
 required to build and run the VB.NET implementation.
 
 ```
-cd vb
+cd impls/vb
 make
 mono ./stepX_YYY.exe
 ```
@@ -1121,7 +1121,7 @@ runs under several different non-web embeddings (runtimes):
 [warpy](https://github.com/kanaka/warpy).
 
 ```
-cd wasm
+cd impls/wasm
 # node
 make wasm_MODE=node
 ./run.js ./stepX_YYY.wasm
@@ -1150,7 +1150,7 @@ warpy --argv --memory-pages 256 ./stepX_YYY.wasm
 The Wren implementation of mal was tested on Wren 0.2.0.
 
 ```
-cd wren
+cd impls/wren
 wren ./stepX_YYY.wren
 ```
 
@@ -1159,7 +1159,7 @@ wren ./stepX_YYY.wren
 The Yorick implementation of mal was tested on Yorick 2.2.04.
 
 ```
-cd yorick
+cd impls/yorick
 yorick -batch ./stepX_YYY.i
 ```
 
@@ -1168,7 +1168,7 @@ yorick -batch ./stepX_YYY.i
 The Zig implementation of mal was tested on Zig 0.5.
 
 ```
-cd zig
+cd impls/zig
 zig build stepX_YYY
 ```
 
diff --git a/impls/.gitignore b/impls/.gitignore
new file mode 100644
index 00000000..c1371974
--- /dev/null
+++ b/impls/.gitignore
@@ -0,0 +1,149 @@
+.DS_Store
+.bash_history
+.cache
+.cargo
+.config
+.mal-history
+.crystal
+.lein
+.m2
+.ivy2
+.sbt
+.npm
+.node-gyp
+package-lock.json
+.elm
+*/experiments
+*/node_modules
+*.o
+*.pyc
+*/step0_repl
+*/step1_read_print
+*/step2_eval
+*/step3_env
+*/step4_if_fn_do
+*/step5_tco
+*/step6_file
+*/step7_quote
+*/step8_macros
+*/step9_try
+*/stepA_mal
+*/mal
+*/notes
+
+logs
+old
+
+ada/obj/
+awk/mal.awk
+bash/mal.sh
+clojure/mal.jar
+clojure/target
+clojure/.lein-repl-history
+coffee/mal.coffee
+cs/*.exe
+cs/*.dll
+cs/*.mdb
+d/*.o
+elixir/_build
+elixir/deps
+elixir/erl_crash.dump
+elixir/*.ez
+erlang/ebin
+erlang/.rebar
+erlang/src/*.beam
+es6/mal.js
+es6/.esm-cache
+factor/mal.factor
+fantom/lib
+forth/mal.fs
+fsharp/*.exe
+fsharp/*.dll
+fsharp/*.mdb
+go/step*
+groovy/*.class
+groovy/mal.jar
+haskell/*.hi
+haskell/*.o
+haxe/*.n
+haxe/*.py
+haxe/cpp/
+haxe/*.js
+java/mal.jar
+java/target/
+java/dependency-reduced-pom.xml
+.npm/
+.node-gyp/
+js/mal.js
+js/web/mal.js
+kotlin/*.jar
+kotlin/.idea
+kotlin/*.iml
+lua/lib
+lua/linenoise.so
+lua/mal.lua
+make/mal.mk
+mal/mal.mal
+matlab/octave-workspace
+miniMAL/mal.json
+nim/nimcache*
+objc/*.d
+ocaml/*.cmi
+ocaml/*.cmo
+ocaml/*.swp
+ocaml/*.cmx
+ocaml/*.o
+ocaml/mal_lib.*
+objpascal/*.o
+objpascal/*.ppu
+objpascal/pas-readline
+objpascal/regexpr/Source/RegExpr.ppu
+perl/mal.pl
+perl6/.precomp/
+php/mal.php
+php/mal-web.php
+ps/mal.ps
+python/mal.pyz
+r/mal.r
+ruby/mal.rb
+.cargo/
+rust/target/
+rust/Cargo.lock
+rust/.cargo
+r/lib
+scala/mal.jar
+scala/target
+scala/project
+skew/*.js
+tcl/mal.tcl
+vb/*.exe
+vb/*.dll
+vimscript/mal.vim
+clisp/*.fas
+clisp/*.lib
+basic/step0_repl.bas
+basic/step1_read_print.bas
+basic/step2_eval.bas
+basic/step3_env.bas
+basic/step4_if_fn_do.bas
+basic/step5_tco.bas
+basic/step6_file.bas
+basic/step7_quote.bas
+basic/step8_macros.bas
+basic/step9_try.bas
+basic/stepA_mal.bas
+basic/*.prg
+common-lisp/*.fasl
+common-lisp/*.lib
+common-lisp/images/*
+common-lisp/hist/*
+livescript/*.js
+!livescript/node_readline.js
+livescript/node_modules
+elm/node_modules
+elm/elm-stuff
+elm/*.js
+!elm/node_readline.js
+!elm/bootstrap.js
+wasm/*.wat
+wasm/*.wasm
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index 0e5db2ad..bb29598f 100755
--- a/run_argv_test.sh
+++ b/impls/tests/run_argv_test.sh
@@ -23,16 +23,16 @@ fi
 
 root="$(dirname $0)"
 
-out="$( $@ $root/tests/print_argv.mal aaa bbb ccc | tr -d '\r' )"
+out="$( $@ $root/print_argv.mal aaa bbb ccc | tr -d '\r' )"
 assert_equal '("aaa" "bbb" "ccc")' "$out"
 
 # Note: The 'make' implementation cannot handle arguments with spaces in them,
 # so for now we skip this test.
 #
-# out="$( $@ $root/tests/print_argv.mal aaa 'bbb ccc' ddd )"
+# out="$( $@ $root/print_argv.mal aaa 'bbb ccc' ddd )"
 # assert_equal '("aaa" "bbb ccc" "ddd")' "$out"
 
-out="$( $@ $root/tests/print_argv.mal | tr -d '\r' )"
+out="$( $@ $root/print_argv.mal | tr -d '\r' )"
 assert_equal '()' "$out"
 
 echo 'Passed all *ARGV* tests'
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