1 // -lang=go1.12 2 3 // Copyright 2021 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Check Go language version-specific errors. 8 9 package p 10 11 // numeric literals 12 const ( 13 _ = 1_000 // ERROR "underscores in numeric literals requires go1.13 or later" 14 _ = 0b111 // ERROR "binary literals requires go1.13 or later" 15 _ = 0o567 // ERROR "0o/0O-style octal literals requires go1.13 or later" 16 _ = 0xabc // ok 17 _ = 0x0p1 // ERROR "hexadecimal floating-point literals requires go1.13 or later" 18 19 _ = 0B111 // ERROR "binary" 20 _ = 0O567 // ERROR "octal" 21 _ = 0Xabc // ok 22 _ = 0X0P1 // ERROR "hexadecimal floating-point" 23 24 _ = 1_000i // ERROR "underscores" 25 _ = 0b111i // ERROR "binary" 26 _ = 0o567i // ERROR "octal" 27 _ = 0xabci // ERROR "hexadecimal floating-point" 28 _ = 0x0p1i // ERROR "hexadecimal floating-point" 29 ) 30 31 // signed shift counts 32 var ( 33 s int 34 _ = 1 << s // ERROR "invalid operation: signed shift count s (variable of type int) requires go1.13 or later" 35 _ = 1 >> s // ERROR "signed shift count" 36 ) 37