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Fix translation of unboxing shim for rust-call ABI methods #18113

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When translating the unboxing shim, account for the fact that the shim translation has already performed the necessary unboxing of input types and values when forwarding to the shimmed function. This prevents ICEing or generating incorrect code.

Closes #16739

When translating the unboxing shim, account for the fact that the shim
translation has already performed the necessary unboxing of input
types and values when forwarding to the shimmed function.  This
prevents ICEing or generating incorrect code.

Closes rust-lang#16739
bors added a commit that referenced this pull request Oct 18, 2014
When translating the unboxing shim, account for the fact that the shim translation has already performed the necessary unboxing of input types and values when forwarding to the shimmed function.  This prevents ICEing or generating incorrect code.

Closes #16739
@bors bors closed this Oct 18, 2014
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ICE: When creating Box<FnOnce<(), ()>> from unsugared unboxed closure
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