Use echom instead of echo in vimscript

Author: bergercookie

ftplugin/vim.vim

@@ -1,5 +1,5 @@
 function! s:DebugStringFunBase(desc, var)
-    let l:debug_str = "echo '" . a:desc . "' . string(" . a:var . ")"
+    let l:debug_str = "echom '" . a:desc . "' . string(" . a:var . ")"
     return l:debug_str
 endfunc
 

test/ft/a.vim

@@ -1,2 +1,2 @@
-echo '[[Vader-workbench]:$1$] DEBUGGING STRING ==> ' . string($2$)
-echo 'a**2 + b**2: ' . string(a**2 + b**2)
+echom '[[Vader-workbench]:$1$] DEBUGGING STRING ==> ' . string($2$)
+echom 'a**2 + b**2: ' . string(a**2 + b**2)