[Bug 285726] make: AT&T/SysV-style substitution error if the pattern starts with 't'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285726

--- Comment #2 from Tavian Barnes <tavianator@tavianator.com> ---
> A sysV style modifier can be mistaken for any of bmake's other modifiers,
> a possible tweak to address this has collateral fallout - needs to be assessed.

True, I see that ${@:M%=b%} treats `%=b%` as a pattern rather than doing the
substitution.

That's a pretty gnarly ambiguity.  At least the :t ones could look ahead for an
`=` or something, but something like this looks impossible to me:

    ${@:S/%.c=O/%/g}

Is that

    S / %.c=O / % /g

or

    S/%.c = O/%/g

?

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