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Assert that ADTs have the right number of substs

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Original file line number	Diff line number	Diff line change
`@@ -1624,6 +1624,13 @@ impl<'tcx> Ty<'tcx> {`
`1624`	`1624`
`1625`	`1625`	`#[inline]`
`1626`	`1626`	`pub fn new_adt(tcx: TyCtxt<'tcx>, def: AdtDef<'tcx>, args: GenericArgsRef<'tcx>) -> Ty<'tcx> {`
	`1627`	`+ debug_assert_eq!(`
	`1628`	`+ tcx.generics_of(def.did()).count(),`
	`1629`	`+ args.len(),`
	`1630`	`+ "wrong number of args for ADT: {:#?} vs {:#?}",`
	`1631`	`+ tcx.generics_of(def.did()).params,`
	`1632`	`+ args`
	`1633`	`+ );`
`1627`	`1634`	`Ty::new(tcx, Adt(def, args))`
`1628`	`1635`	`}`
`1629`	`1636`

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