cli/parser: rescue formula specification errors

This came up recently where an outdated formula definition
caused the program to crash with an ambiguous message when
a user wanted to upgrade a cask instead. Catching these errors
allows them to get handled later on improving error messages
and defaults. Now if the only formula with the given name is
invalid it will default to using the cask unless --formula is
specified.

- https://github.com/Homebrew/brew/issues/16123

Library/Homebrew/cli/named_args.rb

@@ -140,7 +140,8 @@ module Homebrew
               warn_if_cask_conflicts(name, "formula") if only != :formula
               return formula
             rescue FormulaUnreadableError, FormulaClassUnavailableError,
-                   TapFormulaUnreadableError, TapFormulaClassUnavailableError => e
+                   TapFormulaUnreadableError, TapFormulaClassUnavailableError,
+                   FormulaSpecificationError => e
               # Need to rescue before `FormulaUnavailableError` (superclass of this)
               # The formula was found, but there's a problem with its implementation
               unreadable_error ||= e

Library/Homebrew/cli/parser.rb

@@ -653,7 +653,7 @@ module Homebrew
 
           begin
             Formulary.factory(arg, spec, flags: argv.select { |a| a.start_with?("--") })
-          rescue FormulaUnavailableError
+          rescue FormulaUnavailableError, FormulaSpecificationError
             nil
           end
         end.compact.uniq(&:name)