diff --git a/modules/app/write/config.el b/modules/app/write/config.el
index e19746c21..5db8ad4c6 100644
--- a/modules/app/write/config.el
+++ b/modules/app/write/config.el
@@ -36,7 +36,7 @@
                   (IS-LINUX
                    "/usr/share/java/languagetool/languagetool-commandline.jar")))
       (unless (file-exists-p langtool-language-tool-jar)
-        (warn "langtool: couldn't find languagetool-commandline.jar")))))
+        (warn! "Couldn't find languagetool-commandline.jar")))))
 
 
 (when (featurep! +wordnut)
diff --git a/modules/lang/cc/config.el b/modules/lang/cc/config.el
index 0160b8794..c89d83e72 100644
--- a/modules/lang/cc/config.el
+++ b/modules/lang/cc/config.el
@@ -119,7 +119,7 @@ compilation database is present in the project.")
   (add-hook! (c-mode c++-mode objc-mode) #'+cc|init-irony-mode)
   :config
   (unless (file-directory-p irony-server-install-prefix)
-    (warn "irony-mode: server isn't installed; run M-x irony-install-server"))
+    (warn! "Irony server isn't installed. Run M-x irony-install-server"))
   ;; Initialize compilation database, if present. Otherwise, fall back on
   ;; `+cc-default-compiler-options'.
   (add-hook 'irony-mode-hook #'+cc|irony-init-compile-options))
@@ -187,9 +187,9 @@ compilation database is present in the project.")
   :when (featurep! :completion company)
   :after glsl-mode
   :config
-  (if (executable-find "glslangValidator")
-      (warn "glsl-mode: couldn't find glslangValidator, disabling company-glsl")
-    (set! :company-backend 'glsl-mode '(company-glsl))))
+  (unless (executable-find "glslangValidator")
+    (warn! "Couldn't find glslangValidator. Code completion is disabled"))
+  (set! :company-backend 'glsl-mode '(company-glsl)))
 
 
 ;;
@@ -210,7 +210,7 @@ compilation database is present in the project.")
 
   (let ((bins (cl-remove-if #'executable-find '("rdm" "rc"))))
     (if (/= (length bins) 0)
-        (warn "cc-mode: couldn't find the rtag client and/or server programs %s, disabling rtags support" bins)
+        (warn! "Couldn't find the rtag client and/or server programs %s. Disabling rtags support" bins)
       (add-hook! (c-mode c++-mode) #'rtags-start-process-unless-running)
       (set! :lookup '(c-mode c++-mode)
         :definition #'rtags-find-symbol-at-point
diff --git a/modules/lang/crystal/config.el b/modules/lang/crystal/config.el
index 738842bbe..a782a314b 100644
--- a/modules/lang/crystal/config.el
+++ b/modules/lang/crystal/config.el
@@ -19,4 +19,7 @@
 
 
 (def-package! inf-crystal
-  :commands (inf-crystal crystal-switch-to-inf))
+  :commands (inf-crystal crystal-switch-to-inf)
+  :config
+  (unless (executable-find "icr")
+    (warn! "Couldn't find icr. REPL will not work")))
diff --git a/modules/lang/csharp/config.el b/modules/lang/csharp/config.el
index e7907a32a..c994c4e07 100644
--- a/modules/lang/csharp/config.el
+++ b/modules/lang/csharp/config.el
@@ -9,10 +9,10 @@
   (setq omnisharp-auto-complete-want-documentation nil
         omnisharp-cache-directory (concat doom-cache-dir "omnisharp"))
   :config
-  (add-hook! csharp-mode #'(eldoc-mode flycheck-mode omnisharp-mode))
-
   (unless (file-exists-p (omnisharp--server-installation-path t))
-    (warn "csharp-mode: omnisharp server isn't installed, completion won't work"))
+    (warn! "Omnisharp server isn't installed, completion won't work"))
+
+  (add-hook! csharp-mode #'(eldoc-mode flycheck-mode omnisharp-mode))
 
   (defun +csharp|cleanup-omnisharp-server ()
     "Clean up the omnisharp server once you kill the last csharp-mode buffer."
diff --git a/modules/lang/go/config.el b/modules/lang/go/config.el
index 694e685c7..cd655e9ef 100644
--- a/modules/lang/go/config.el
+++ b/modules/lang/go/config.el
@@ -76,14 +76,14 @@
              go-guru-expand-region)
   :config
   (unless (executable-find "guru")
-    (warn "go-mode: couldn't find guru, refactoring commands won't work")))
+    (warn! "Couldn't find guru. Refactoring commands (go-guru-*) won't work")))
 
 
 (def-package! gorepl-mode
   :commands (gorepl-run gorepl-run-load-current-file)
   :config
   (unless (executable-find "gore")
-    (warn "go-mode: couldn't find gore, REPL support disabled")))
+    (warn! "Couldn't find gore. REPL will not work")))
 
 
 (def-package! company-go
@@ -92,6 +92,6 @@
   :after go-mode
   :config
   (setq company-go-show-annotation t)
-  (if (executable-find command-go-gocode-command)
-      (set! :company-backend 'go-mode '(company-go))
-    (warn "go-mode: couldn't find gocode, code completion won't work")))
+  (set! :company-backend 'go-mode '(company-go))
+  (unless (executable-find command-go-gocode-command)
+    (warn! "Couldn't find gocode. Code completion won't work")))
diff --git a/modules/lang/haskell/+dante.el b/modules/lang/haskell/+dante.el
index 9e580ae51..3064b5ff2 100644
--- a/modules/lang/haskell/+dante.el
+++ b/modules/lang/haskell/+dante.el
@@ -5,11 +5,9 @@
   :after haskell-mode
   :hook (haskell-mode . dante-mode)
   :config
-  (add-hook 'haskell-mode-hook #'interactive-haskell-mode)
-
   (unless (executable-find "cabal")
-    (warn "haskell-mode: couldn't find cabal")
-    (remove-hook 'haskell-mode-hook #'dante-mode))
+    (warn! "Couldn't find cabal, haskell-mode may have issues"))
 
+  (add-hook 'haskell-mode-hook #'interactive-haskell-mode)
   (add-hook 'dante-mode-hook #'flycheck-mode))
 
diff --git a/modules/lang/haskell/+intero.el b/modules/lang/haskell/+intero.el
index e3b3ab643..c423fd149 100644
--- a/modules/lang/haskell/+intero.el
+++ b/modules/lang/haskell/+intero.el
@@ -5,8 +5,7 @@
   :hook (haskell-mode . intero-mode)
   :config
   (unless (executable-find "stack")
-    (warn "haskell-mode: couldn't find stack, disabling intero")
-    (remove-hook 'haskell-mode-hook #'intero-mode))
+    (warn! "Couldn't find stack. Intero has been disabled."))
 
   (add-hook! 'intero-mode-hook #'(flycheck-mode eldoc-mode))
 
diff --git a/modules/lang/haskell/config.el b/modules/lang/haskell/config.el
index ed5c84b50..6d5987b1b 100644
--- a/modules/lang/haskell/config.el
+++ b/modules/lang/haskell/config.el
@@ -31,10 +31,9 @@
   :init
   (add-hook 'haskell-mode-hook #'ghc-comp-init)
   :config
-  (if (executable-find "ghc-mod")
-      (set! :company-backend 'haskell-mode #'company-ghc)
-    (warn "haskell-mode: couldn't find ghc-mod on PATH")
-    (remove-hook 'haskell-mode-hook #'ghc-comp-init))
+  (unless (executable-find "ghc-mod")
+    (warn! "Couldn't find ghc-mod on PATH. Code completion is disabled."))
 
-  (setq company-ghc-show-info 'oneline))
+  (setq company-ghc-show-info 'oneline)
+  (set! :company-backend 'haskell-mode #'company-ghc))
 
diff --git a/modules/lang/java/config.el b/modules/lang/java/config.el
index 8194c7923..c565b493e 100644
--- a/modules/lang/java/config.el
+++ b/modules/lang/java/config.el
@@ -5,7 +5,7 @@
 (cond ((featurep! +meghanada) (load! +meghanada))
       ((featurep! +eclim) ; FIXME lang/java +eclim
        ;;(load! +eclim)
-       (warn "java-mode: eclim support isn't implemented yet")))
+       (warn! "Eclim support isn't implemented yet")))
 
 
 ;;
diff --git a/modules/lang/plantuml/config.el b/modules/lang/plantuml/config.el
index 457f2872d..d13baf316 100644
--- a/modules/lang/plantuml/config.el
+++ b/modules/lang/plantuml/config.el
@@ -2,14 +2,15 @@
 
 (def-package! plantuml-mode
   :mode "\\.p\\(lant\\)?uml$"
-  :config
+  :init
   (setq plantuml-jar-path (concat doom-etc-dir "plantuml.jar"))
+  :config
   (set! :popup "^\\*PLANTUML" '((size . 0.4)) '((select) (transient . 0)))
 
   (unless (executable-find "java")
-    (warn "plantuml-mode: can't find java, preview disabled."))
+    (warn! "Couldn't find java. Disabling plantuml preview."))
   (unless (file-exists-p plantuml-jar-path)
-    (warn "plantuml-mode: can't find plantuml.jar; run M-x +plantuml/install.")))
+    (warn! "Couldn't find plantuml.jar. Install it witInstall it with-x +plantuml/install.")))
 
 
 (def-package! flycheck-plantuml
diff --git a/modules/lang/rust/config.el b/modules/lang/rust/config.el
index 4faadda6c..da7d3b064 100644
--- a/modules/lang/rust/config.el
+++ b/modules/lang/rust/config.el
@@ -30,7 +30,7 @@
                                 (expand-file-name "rust/src/" +rust-src-dir)))
 
   (unless (file-exists-p racer-cmd)
-    (warn "rust-mode: racer binary can't be found; auto-completion is disabled"))
+    (warn! "Couldn't find racer binary. Code completion won't work"))
 
   (set! :lookup 'rust-mode :definition #'racer-find-definition))