Tighten up validity check.

scripts/lib/bashy-core/arg-processor.sh

@@ -744,6 +744,11 @@ function _argproc_janky-args {
         error-msg --file-line=2 'Cannot use both --required and --init.'
         _argproc_declarationError=1
         return 1
+    elif (( gotInit )) && [[ ${optVar} == '' ]]; then
+        # Special case: `--init` is meaningless without `--var`.
+        error-msg --file-line=2 'Must use --var when --init is used.'
+        _argproc_declarationError=1
+        return 1
     elif [[ ${argSpecs} =~ ' call '|' var ' ]]; then
         # Special case for `--call` and `--var` (which always go together).
         if [[ (${optCall} == '') && (${optVar} == '') ]]; then

tests/02-core/03-arg-processor/90-init-required/expect.md

@@ -3,9 +3,12 @@
 ### stderr
 ```
 the-cmd: 
-the-cmd:18: Cannot use both --required and --init.
 the-cmd:19: Cannot use both --required and --init.
 the-cmd:20: Cannot use both --required and --init.
+the-cmd:21: Cannot use both --required and --init.
+the-cmd:24: Must use --var when --init is used.
+the-cmd:25: Must use --var when --init is used.
+the-cmd:26: Must use --var when --init is used.
 Cannot process arguments, due to declaration errors.
 
 the-cmd -- test command

tests/02-core/03-arg-processor/90-init-required/the-cmd

@@ -15,10 +15,16 @@ define-usage $'
     This is a test command.
 '
 
+# Can't use both `--init` and `--required`.
 opt-value --required --var=var1 --init=florp some-value
 opt-choice --init=maybe --required --var=var3 yes no
 positional-arg --init=x --var=var4 --required some-position
 
+# Can't use `--init` without `--var`.
+opt-value --init=x --call=func1 beep
+opt-choice --init=x --call=func2 bomp blump
+positional-arg --init=x --call=func3 plomp
+
 process-args "$@" || usage --short
 
 echo 'Nopers.'