vendor: go get github.com/hashicorp/hcl2@master

This includes a new specialized error message for when a fractional number
is used to index a sequence.

go.mod

@@ -60,7 +60,7 @@ require (
 	github.com/hashicorp/go-version v1.1.0
 	github.com/hashicorp/golang-lru v0.5.0 // indirect
 	github.com/hashicorp/hcl v0.0.0-20170504190234-a4b07c25de5f
-	github.com/hashicorp/hcl2 v0.0.0-20190402200843-8b450a7d58f9
+	github.com/hashicorp/hcl2 v0.0.0-20190416162332-2c5a4b7d729a
 	github.com/hashicorp/hil v0.0.0-20190212112733-ab17b08d6590
 	github.com/hashicorp/logutils v1.0.0
 	github.com/hashicorp/memberlist v0.1.0 // indirect

go.sum

@@ -202,8 +202,8 @@ github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ
 github.com/hashicorp/hcl v0.0.0-20170504190234-a4b07c25de5f h1:UdxlrJz4JOnY8W+DbLISwf2B8WXEolNRA8BGCwI9jws=
 github.com/hashicorp/hcl v0.0.0-20170504190234-a4b07c25de5f/go.mod h1:oZtUIOe8dh44I2q6ScRibXws4Ajl+d+nod3AaR9vL5w=
 github.com/hashicorp/hcl2 v0.0.0-20181208003705-670926858200/go.mod h1:ShfpTh661oAaxo7VcNxg0zcZW6jvMa7Moy2oFx7e5dE=
-github.com/hashicorp/hcl2 v0.0.0-20190402200843-8b450a7d58f9 h1:zCITwiA0cog6aYr/a/McDHKtgsEpYxXvTIgugv5iu8o=
-github.com/hashicorp/hcl2 v0.0.0-20190402200843-8b450a7d58f9/go.mod h1:HtEzazM5AZ9fviNEof8QZB4T1Vz9UhHrGhnMPzl//Ek=
+github.com/hashicorp/hcl2 v0.0.0-20190416162332-2c5a4b7d729a h1:doKt9ZBCYgYQrGK6CqJsEB+8xqm3WoFyKu4TPZlyymg=
+github.com/hashicorp/hcl2 v0.0.0-20190416162332-2c5a4b7d729a/go.mod h1:HtEzazM5AZ9fviNEof8QZB4T1Vz9UhHrGhnMPzl//Ek=
 github.com/hashicorp/hil v0.0.0-20190212112733-ab17b08d6590 h1:2yzhWGdgQUWZUCNK+AoO35V+HTsgEmcM4J9IkArh7PI=
 github.com/hashicorp/hil v0.0.0-20190212112733-ab17b08d6590/go.mod h1:n2TSygSNwsLJ76m8qFXTSc7beTb+auJxYdqrnoqwZWE=
 github.com/hashicorp/logutils v1.0.0 h1:dLEQVugN8vlakKOUE3ihGLTZJRB4j+M2cdTm/ORI65Y=

vendor/github.com/hashicorp/hcl2/hcl/ops.go

@@ -2,6 +2,7 @@ package hcl
 
 import (
 	"fmt"
+	"math/big"
 
 	"github.com/zclconf/go-cty/cty"
 	"github.com/zclconf/go-cty/cty/convert"
@@ -84,6 +85,27 @@ func Index(collection, key cty.Value, srcRange *Range) (cty.Value, Diagnostics)
 			}
 		}
 		if has.False() {
+			// We have a more specialized error message for the situation of
+			// using a fractional number to index into a sequence, because
+			// that will tend to happen if the user is trying to use division
+			// to calculate an index and not realizing that HCL does float
+			// division rather than integer division.
+			if (ty.IsListType() || ty.IsTupleType()) && key.Type().Equals(cty.Number) {
+				if key.IsKnown() && !key.IsNull() {
+					bf := key.AsBigFloat()
+					if _, acc := bf.Int(nil); acc != big.Exact {
+						return cty.DynamicVal, Diagnostics{
+							{
+								Severity: DiagError,
+								Summary:  "Invalid index",
+								Detail:   fmt.Sprintf("The given key does not identify an element in this collection value: indexing a sequence requires a whole number, but the given index (%g) has a fractional part.", bf),
+								Subject:  srcRange,
+							},
+						}
+					}
+				}
+			}
+
 			return cty.DynamicVal, Diagnostics{
 				{
 					Severity: DiagError,

vendor/github.com/hashicorp/hcl2/hcl/pos.go

@@ -31,6 +31,9 @@ type Pos struct {
 	Byte int
 }
 
+// InitialPos is a suitable position to use to mark the start of a file.
+var InitialPos = Pos{Byte: 0, Line: 1, Column: 1}
+
 // Range represents a span of characters between two positions in a source
 // file.
 //

vendor/github.com/hashicorp/hcl2/hcl/pos_scanner.go

@@ -29,8 +29,8 @@ type RangeScanner struct {
 	err error  // error from last scan, if any
 }
 
-// Create a new RangeScanner for the given buffer, producing ranges for the
-// given filename.
+// NewRangeScanner creates a new RangeScanner for the given buffer, producing
+// ranges for the given filename.
 //
 // Since ranges have grapheme-cluster granularity rather than byte granularity,
 // the scanner will produce incorrect results if the given SplitFunc creates
@@ -39,15 +39,19 @@ type RangeScanner struct {
 // around individual UTF-8 sequences, which will split any multi-sequence
 // grapheme clusters.
 func NewRangeScanner(b []byte, filename string, cb bufio.SplitFunc) *RangeScanner {
+	return NewRangeScannerFragment(b, filename, InitialPos, cb)
+}
+
+// NewRangeScannerFragment is like NewRangeScanner but the ranges it produces
+// will be offset by the given starting position, which is appropriate for
+// sub-slices of a file, whereas NewRangeScanner assumes it is scanning an
+// entire file.
+func NewRangeScannerFragment(b []byte, filename string, start Pos, cb bufio.SplitFunc) *RangeScanner {
 	return &RangeScanner{
 		filename: filename,
 		b:        b,
 		cb:       cb,
-		pos: Pos{
-			Byte:   0,
-			Line:   1,
-			Column: 1,
-		},
+		pos:      start,
 	}
 }
 

vendor/modules.txt

@@ -307,7 +307,7 @@ github.com/hashicorp/hcl/hcl/scanner
 github.com/hashicorp/hcl/hcl/strconv
 github.com/hashicorp/hcl/json/scanner
 github.com/hashicorp/hcl/json/token
-# github.com/hashicorp/hcl2 v0.0.0-20190402200843-8b450a7d58f9
+# github.com/hashicorp/hcl2 v0.0.0-20190416162332-2c5a4b7d729a
 github.com/hashicorp/hcl2/hcl
 github.com/hashicorp/hcl2/hcl/hclsyntax
 github.com/hashicorp/hcl2/hcldec