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This allows us to propagate property evaluation error to a string property. For
instance, "s.contains(x ++ y)" will be an error if "y" failed to evaluate,
whereas bare "x ++ y" shouldn't.
The other implementation ideas:
a. add Template::into_string_property() to enable strict evaluation
=> it's tedious to implement it for each printable type
b. pass (formatter, error_handler) arguments separately
=> works, but most implementors don't need error_handler argument
c. pass strict=bool flag around build_*() functions
=> didn't tried, but it would be more complicated than this patch
Because Template trait is now implementation detail of the templater, it
should be okay to use a non-standard formatter wrapper.
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