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Auto merge of rust-lang#31410 - rkruppe:issue31109, r=pnkfelix
Issue rust-lang#31109 uncovered two semi-related problems: * A panic in `str::parse::<f64>` * A panic in `rustc::middle::const_eval::lit_to_const` where the result of float parsing was unwrapped. This series of commits fixes both issues and also drive-by-fixes some things I noticed while tracking down the parsing panic.
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Original file line number | Diff line number | Diff line change |
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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mod _common; | ||
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use std::char; | ||
use _common::validate; | ||
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fn main() { | ||
for n in 0..10 { | ||
let digit = char::from_digit(n, 10).unwrap(); | ||
let mut s = "0.".to_string(); | ||
for _ in 0..400 { | ||
s.push(digit); | ||
if s.parse::<f64>().is_ok() { | ||
validate(&s); | ||
} | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,15 @@ | ||
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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fn main() { | ||
// FIXME(#31407) this error should go away, but in the meantime we test that it | ||
// is accompanied by a somewhat useful error message. | ||
let _: f64 = 1234567890123456789012345678901234567890e-340; //~ ERROR could not evaluate float | ||
} |