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Check hypothetically failing conversion

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This commit is contained in:
Oliver Scherer 2019-01-28 10:32:34 +01:00
parent 8a417204f8
commit c67a05166f
1 changed files with 2 additions and 1 deletions
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3
clippy_lints/src/consts.rs
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@ -12,6 +12,7 @@ use std::cmp::Ordering::{self, Equal};
use std::cmp::PartialOrd;
use std::convert::TryInto;
use std::hash::{Hash, Hasher};
use std::convert::TryFrom;
use syntax::ast::{FloatTy, LitKind};
use syntax::ptr::P;
use syntax_pos::symbol::Symbol;
@ -446,7 +447,7 @@ pub fn miri_to_const<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, result: &ty::Const<'
ty::Str => {
let alloc = tcx.alloc_map.lock().unwrap_memory(ptr.alloc_id);
let offset = ptr.offset.bytes().try_into().expect("too-large pointer offset");
let n = n as usize;
let n = usize::try_from(n).unwrap();
String::from_utf8(alloc.bytes[offset..(offset + n)].to_owned())
.ok()
.map(Constant::Str)