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go/scanner: accepts floating point literals with no decimals after E #17621

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josharian opened this issue Oct 26, 2016 · 2 comments
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go/scanner: accepts floating point literals with no decimals after E #17621

josharian opened this issue Oct 26, 2016 · 2 comments
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Go1.8

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@josharian
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package main

const X = 0E
$ go tool compile x.go
x.go:3: malformed floating-point constant exponent
x.go:3: malformed constant: 0E
$ gotype x.go
$

gccgo also rejects this code. gc and gccgo are correct. From the spec's floating-point literal definition: exponent = ( "e" | "E" ) [ "+" | "-" ] decimals .

cc @mdempsky @griesemer

Found using go-fuzz (@dvyukov).
@josharian josharian added this to the Unplanned milestone Oct 26, 2016
@griesemer griesemer changed the title go/types: accepts floating point literals with no decimals after E go/parser: accepts floating point literals with no decimals after E Oct 26, 2016
@griesemer griesemer modified the milestones: Go1.8, Unplanned Oct 26, 2016
@griesemer griesemer self-assigned this Oct 26, 2016
@griesemer
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holy cow!

@griesemer griesemer changed the title go/parser: accepts floating point literals with no decimals after E go/scanner: accepts floating point literals with no decimals after E Oct 26, 2016
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CL https://golang.org/cl/32096 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 26, 2017
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