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Rollup merge of #49083 - oli-obk:mopsgeschwindigkeit, r=michaelwoerister

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Only generate miri backtraces if explicitly requested

fixes #49072
fixes #48888

r? @michaelwoerister
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kennytm 2018-03-17 17:20:49 +08:00 • committed by GitHub
commit ef9581e757
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2
src/librustc/mir/interpret/error.rs
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@ -20,7 +20,7 @@ pub struct EvalError<'tcx> {
impl<'tcx> From<EvalErrorKind<'tcx>> for EvalError<'tcx> {
fn from(kind: EvalErrorKind<'tcx>) -> Self {
let backtrace = match env::var("RUST_BACKTRACE") {
let backtrace = match env::var("MIRI_BACKTRACE") {
Ok(ref val) if !val.is_empty() => Some(Backtrace::new_unresolved()),
_ => None
};