staticcheck: fix incorrect range on suggested edit

Signed-off-by: sourya <souryavatsyayan@gmail.com>
Closes: gh-867 [via git-merge-pr]
Closes gh-866

staticcheck/lint.go

@@ -3381,6 +3381,9 @@ func CheckMissingEnumTypesInDeclaration(pass *analysis.Pass) (interface{}, error
 			for _, spec := range group[1:] {
 				nspec := *spec.(*ast.ValueSpec)
 				nspec.Type = typ
+				// The position of `spec` node excludes comments (if any).
+				// However, on generating the source back from the node, the comments are included. Setting `Comment` to nil ensures deduplication of comments.
+				nspec.Comment = nil
 				edits = append(edits, edit.ReplaceWithNode(pass.Fset, spec, &nspec))
 			}
 			report.Report(pass, group[0], "only the first constant in this group has an explicit type", report.Fixes(edit.Fix("add type to all constants in group", edits...)))

staticcheck/testdata/src/CheckMissingEnumTypesInDeclaration/CheckMissingEnumTypesInDeclaration.go

@@ -11,7 +11,7 @@ const (
 
 const (
 	c6 int = 1 // want `only the first constant in this group has an explicit type`
-	c7     = 2
+	c7     = 2 // comment for testing https://github.com/dominikh/go-tools/issues/866
 	c8     = 3
 )
 

staticcheck/testdata/src/CheckMissingEnumTypesInDeclaration/CheckMissingEnumTypesInDeclaration.go.golden

@@ -11,7 +11,7 @@ const (
 
 const (
 	c6 int = 1 // want `only the first constant in this group has an explicit type`
-	c7 int = 2
+	c7 int = 2 // comment for testing https://github.com/dominikh/go-tools/issues/866
 	c8 int = 3
 )