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Rollup merge of rust-lang#40589 - topecongiro:floating-point-literal, r=nagisa
Parse 0e+10 as a valid floating-point literal Fixes issue rust-lang#40408.
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src/libsyntax/parse/lexer/mod.rs

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@@ -725,7 +725,7 @@ impl<'a> StringReader<'a> {
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base = 16;
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num_digits = self.scan_digits(16, 16);
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}
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'0'...'9' | '_' | '.' => {
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'0'...'9' | '_' | '.' | 'e' | 'E' => {
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num_digits = self.scan_digits(10, 10) + 1;
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}
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_ => {

src/test/run-pass/issue-40408.rs

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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn main() {
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println!("{}", 0E+10);
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println!("{}", 0e+10);
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println!("{}", 00e+10);
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println!("{}", 00E+10);
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}

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