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Pick the first excessive positional arg for the caret.
Note that erroring on named args doesn't do the obvious thing
in this regard.
If `k` was removed from the signature, then `f(k=1, i=2, j=3)`
doesn't tell us much about the wrong arg, because naming takes
the `k=1` as an assignment, `i` as duplicate naming. No arg is
deemed extra, though further inspection of the conflicting args
might get there. Since assignment syntax in parens is more|less
deprecated (?), no more effort is done here.
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Use removeNames to help diagnose the application.
Supplement the error message with how many extra
args and any other residual assignments that the
user might have thought was a properly named arg.
The error message is gradual: succinct for short
arg lists, more verbose for longer applications.
Very long arg lists are probably generated, so
that message is the least colloquial.
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Since mkInvoke, the applyDynamic/selectDynamic/etc desugarer, is disconnected
from typedNamedApply, the applyDynamicNamed argument rewriter, the latter
doesn’t know whether it needs to apply the rewriting because the application
has just been desugared or it needs to hold on because it’s already performed
a desugaring on this tree.
This commit introduces the attachment that links these translation facilities,
preventing infinite applyDynamicNamed desugarings.
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