cmd/vet: print: permit '#' flag in %e, %f, and %g

+ Test

Change-Id: I7b42ff70f26a58e1cf58cbbc53d02a65623456ae
Reviewed-on: https://go-review.googlesource.com/62371
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/vet/print.go

@@ -440,12 +440,12 @@ var printVerbs = []printVerb{
 	{'b', numFlag, argInt | argFloat | argComplex},
 	{'c', "-", argRune | argInt},
 	{'d', numFlag, argInt},
-	{'e', numFlag, argFloat | argComplex},
-	{'E', numFlag, argFloat | argComplex},
-	{'f', numFlag, argFloat | argComplex},
-	{'F', numFlag, argFloat | argComplex},
-	{'g', numFlag, argFloat | argComplex},
-	{'G', numFlag, argFloat | argComplex},
+	{'e', sharpNumFlag, argFloat | argComplex},
+	{'E', sharpNumFlag, argFloat | argComplex},
+	{'f', sharpNumFlag, argFloat | argComplex},
+	{'F', sharpNumFlag, argFloat | argComplex},
+	{'g', sharpNumFlag, argFloat | argComplex},
+	{'G', sharpNumFlag, argFloat | argComplex},
 	{'o', sharpNumFlag, argInt},
 	{'p', "-#", argPointer},
 	{'q', " -+.0#", argRune | argInt | argString},

src/cmd/vet/testdata/print.go

@@ -102,6 +102,7 @@ func PrintfTests() {
 	fmt.Printf("%s", interface{}(nil)) // Nothing useful we can say.
 
 	fmt.Printf("%g", 1+2i)
+	fmt.Printf("%#e %#E %#f %#F %#g %#G", 1.2, 1.2, 1.2, 1.2, 1.2, 1.2) // OK since Go 1.9
 	// Some bad format/argTypes
 	fmt.Printf("%b", "hi")                     // ERROR "arg .hi. for printf verb %b of wrong type"
 	fmt.Printf("%t", c)                        // ERROR "arg c for printf verb %t of wrong type"