diff --git a/vendor/github.com/mvdan/sh/interp/arith.go b/vendor/github.com/mvdan/sh/interp/arith.go
index 36c1d127..ba07b678 100644
--- a/vendor/github.com/mvdan/sh/interp/arith.go
+++ b/vendor/github.com/mvdan/sh/interp/arith.go
@@ -11,8 +11,8 @@ import (
 
 func (r *Runner) arithm(expr syntax.ArithmExpr) int {
 	switch x := expr.(type) {
-	case *syntax.Word:
-		str := r.loneWord(x)
+	case *syntax.Lit:
+		str := x.Value
 		// recursively fetch vars
 		for {
 			val := r.getVar(str)
@@ -23,12 +23,14 @@ func (r *Runner) arithm(expr syntax.ArithmExpr) int {
 		}
 		// default to 0
 		return atoi(str)
+	case *syntax.ParamExp:
+		return atoi(r.paramExp(x))
 	case *syntax.ParenArithm:
 		return r.arithm(x.X)
 	case *syntax.UnaryArithm:
 		switch x.Op {
 		case syntax.Inc, syntax.Dec:
-			name := x.X.(*syntax.Word).Parts[0].(*syntax.Lit).Value
+			name := x.X.(*syntax.Lit).Value
 			old := atoi(r.getVar(name))
 			val := old
 			if x.Op == syntax.Inc {
@@ -81,7 +83,7 @@ func atoi(s string) int {
 }
 
 func (r *Runner) assgnArit(b *syntax.BinaryArithm) int {
-	name := b.X.(*syntax.Word).Parts[0].(*syntax.Lit).Value
+	name := b.X.(*syntax.Lit).Value
 	val := atoi(r.getVar(name))
 	arg := r.arithm(b.Y)
 	switch b.Op {
@@ -105,7 +107,7 @@ func (r *Runner) assgnArit(b *syntax.BinaryArithm) int {
 		val ^= arg
 	case syntax.ShlAssgn:
 		val <<= uint(arg)
-	default: // syntax.ShrAssgn
+	case syntax.ShrAssgn:
 		val >>= uint(arg)
 	}
 	r.setVar(name, strconv.Itoa(val))
diff --git a/vendor/github.com/mvdan/sh/interp/builtin.go b/vendor/github.com/mvdan/sh/interp/builtin.go
index 1fa235b5..b195a988 100644
--- a/vendor/github.com/mvdan/sh/interp/builtin.go
+++ b/vendor/github.com/mvdan/sh/interp/builtin.go
@@ -5,13 +5,26 @@ package interp
 
 import (
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strconv"
 
 	"github.com/mvdan/sh/syntax"
 )
 
-func (r *Runner) builtin(pos syntax.Pos, name string, args []string) bool {
+func isBuiltin(name string) bool {
+	switch name {
+	case "true", ":", "false", "exit", "set", "shift", "unset",
+		"echo", "printf", "break", "continue", "pwd", "cd",
+		"wait", "builtin", "trap", "type", "source", "command",
+		"pushd", "popd", "umask", "alias", "unalias", "fg", "bg",
+		"getopts":
+		return true
+	}
+	return false
+}
+
+func (r *Runner) builtin(pos syntax.Pos, name string, args []string) {
 	exit := 0
 	switch name {
 	case "true", ":":
@@ -46,6 +59,7 @@ func (r *Runner) builtin(pos syntax.Pos, name string, args []string) bool {
 		default:
 			r.errf("usage: shift [n]\n")
 			exit = 2
+			break
 		}
 		if len(r.args) < n {
 			n = len(r.args)
@@ -160,20 +174,28 @@ func (r *Runner) builtin(pos syntax.Pos, name string, args []string) bool {
 		if len(args) < 1 {
 			break
 		}
-		// TODO: pos
-		if !r.builtin(0, args[0], args[1:]) {
+		if !isBuiltin(args[0]) {
 			exit = 1
+			break
 		}
-	case "trap", "type", "source", "command", "pushd", "popd",
+		// TODO: pos
+		r.builtin(0, args[0], args[1:])
+	case "type":
+		for _, arg := range args {
+			if isBuiltin(arg) {
+				r.outf("%s is a shell builtin\n", arg)
+				continue
+			}
+			if path, err := exec.LookPath(arg); err == nil {
+				r.outf("%s is %s\n", arg, path)
+				continue
+			}
+			exit = 1
+			r.errf("type: %s: not found\n", arg)
+		}
+	case "trap", "source", "command", "pushd", "popd",
 		"umask", "alias", "unalias", "fg", "bg", "getopts":
 		r.errf("unhandled builtin: %s", name)
-	// TODO(mvdan): we rely on the binary versions of these, we
-	// should eventually implement them as builtins like Bash for
-	// portability
-	// case "[", "test":
-	default:
-		return false
 	}
 	r.exit = exit
-	return true
 }
diff --git a/vendor/github.com/mvdan/sh/interp/interp.go b/vendor/github.com/mvdan/sh/interp/interp.go
index d2472aa9..592d96fb 100644
--- a/vendor/github.com/mvdan/sh/interp/interp.go
+++ b/vendor/github.com/mvdan/sh/interp/interp.go
@@ -98,12 +98,10 @@ func (r *Runner) varInd(v varValue, e syntax.ArithmExpr) string {
 		}
 	case []string:
 		// TODO: @ between double quotes
-		if w, ok := e.(*syntax.Word); ok {
-			if lit, ok := w.Parts[0].(*syntax.Lit); ok {
-				switch lit.Value {
-				case "@", "*":
-					return strings.Join(x, " ")
-				}
+		if lit, ok := e.(*syntax.Lit); ok {
+			switch lit.Value {
+			case "@", "*":
+				return strings.Join(x, " ")
 			}
 		}
 		i := r.arithm(e)
@@ -373,6 +371,7 @@ func (r *Runner) cmd(cm syntax.Command) {
 			r.stmts(x.ThenStmts)
 			return
 		}
+		r.exit = 0
 		for _, el := range x.Elifs {
 			r.stmts(el.CondStmts)
 			if r.exit == 0 {
@@ -381,9 +380,6 @@ func (r *Runner) cmd(cm syntax.Command) {
 			}
 		}
 		r.stmts(x.ElseStmts)
-		if len(x.Elifs)+len(x.ElseStmts) == 0 {
-			r.exit = 0
-		}
 	case *syntax.WhileClause:
 		for r.err == nil {
 			r.stmts(x.CondStmts)
@@ -559,10 +555,16 @@ func (r *Runner) wordParts(wps []syntax.WordPart, quoted bool) []string {
 			curBuf.WriteString(field)
 		}
 	}
-	for _, wp := range wps {
+	for i, wp := range wps {
 		switch x := wp.(type) {
 		case *syntax.Lit:
-			curBuf.WriteString(x.Value)
+			s := x.Value
+			if i > 0 || len(s) == 0 || s[0] != '~' {
+			} else if len(s) < 2 || s[1] == '/' {
+				// TODO: ~someuser
+				s = r.getVar("HOME") + s[1:]
+			}
+			curBuf.WriteString(s)
 		case *syntax.SglQuoted:
 			curBuf.WriteString(x.Value)
 		case *syntax.DblQuoted:
@@ -619,7 +621,8 @@ func (r *Runner) call(pos syntax.Pos, name string, args []string) {
 		r.args = oldArgs
 		return
 	}
-	if r.builtin(pos, name, args) {
+	if isBuiltin(name) {
+		r.builtin(pos, name, args)
 		return
 	}
 	cmd := exec.CommandContext(r.Context, name, args...)
diff --git a/vendor/github.com/mvdan/sh/interp/param.go b/vendor/github.com/mvdan/sh/interp/param.go
index a15d1f23..9fe92bb1 100644
--- a/vendor/github.com/mvdan/sh/interp/param.go
+++ b/vendor/github.com/mvdan/sh/interp/param.go
@@ -40,7 +40,7 @@ func (r *Runner) paramExp(pe *syntax.ParamExp) string {
 	switch {
 	case pe.Length:
 		str = strconv.Itoa(utf8.RuneCountInString(str))
-	case pe.Excl:
+	case pe.Indirect:
 		val, set = r.lookupVar(str)
 		str = varStr(val)
 	}
@@ -141,7 +141,7 @@ func (r *Runner) paramExp(pe *syntax.ParamExp) string {
 			str = string(rs)
 		case syntax.LowerAll:
 			str = strings.ToLower(str)
-		default: // syntax.OtherParamOps
+		case syntax.OtherParamOps:
 			switch arg {
 			case "Q":
 				str = strconv.Quote(str)
diff --git a/vendor/github.com/mvdan/sh/interp/test.go b/vendor/github.com/mvdan/sh/interp/test.go
index 1d1fd403..ef7246e9 100644
--- a/vendor/github.com/mvdan/sh/interp/test.go
+++ b/vendor/github.com/mvdan/sh/interp/test.go
@@ -74,10 +74,10 @@ func (r *Runner) binTest(op syntax.BinTestOperator, x, y string) bool {
 		return x != "" && y != ""
 	case syntax.OrTest:
 		return x != "" || y != ""
-	case syntax.TsEqual:
+	case syntax.TsMatch:
 		m, _ := path.Match(y, x)
 		return m
-	case syntax.TsNequal:
+	case syntax.TsNoMatch:
 		m, _ := path.Match(y, x)
 		return !m
 	case syntax.TsBefore:
diff --git a/vendor/github.com/mvdan/sh/syntax/canonical.sh b/vendor/github.com/mvdan/sh/syntax/canonical.sh
index e0acfc32..e67bd5b7 100644
--- a/vendor/github.com/mvdan/sh/syntax/canonical.sh
+++ b/vendor/github.com/mvdan/sh/syntax/canonical.sh
@@ -25,9 +25,9 @@ case $foo in
 esac
 
 foo | bar
-foo \
-	&& $(bar) \
-	&& (more)
+foo &&
+	$(bar) &&
+	(more)
 
 foo 2>&1
 foo <<EOF
diff --git a/vendor/github.com/mvdan/sh/syntax/lexer.go b/vendor/github.com/mvdan/sh/syntax/lexer.go
index a4f19e15..4008f2d0 100644
--- a/vendor/github.com/mvdan/sh/syntax/lexer.go
+++ b/vendor/github.com/mvdan/sh/syntax/lexer.go
@@ -732,15 +732,37 @@ loop:
 			if p.quote&allArithmExpr != 0 {
 				break loop
 			}
-		case ':', '=', '%', '?', '^', ',':
+			if p.quote == paramName && p.peekByte('(') {
+				tok = _Lit
+				break loop
+			}
+		case '?':
+			if p.quote == paramName && p.peekByte('(') {
+				tok = _Lit
+				break loop
+			}
+			fallthrough
+		case ':', '=', '%', '^', ',':
 			if p.quote&allArithmExpr != 0 || p.quote&allParamReg != 0 {
 				break loop
 			}
-		case '#', '[', '@':
+		case '@':
+			if p.quote == paramName && p.peekByte('(') {
+				tok = _Lit
+				break loop
+			}
+			fallthrough
+		case '#', '[':
 			if p.quote&allParamReg != 0 {
 				break loop
 			}
-		case '+', '-':
+		case '+':
+			if p.quote == paramName && p.peekByte('(') {
+				tok = _Lit
+				break loop
+			}
+			fallthrough
+		case '-':
 			switch p.quote {
 			case paramExpInd, paramExpLen, paramExpOff,
 				paramExpExp, paramExpRepl, sglQuotes:
@@ -778,7 +800,7 @@ loop:
 					p.discardLit(1)
 					if r = p.rune(); r == '\\' {
 						p.discardLit(1)
-						r = p.rune()
+						p.rune()
 					}
 				}
 			}
@@ -893,7 +915,7 @@ func (p *parser) hdocLitWord() *Word {
 		r = p.rune()
 	}
 	l := p.lit(pos, val)
-	return p.word(p.singleWps(l))
+	return p.word(p.wps(l))
 }
 
 func (p *parser) advanceLitRe(r rune) {
diff --git a/vendor/github.com/mvdan/sh/syntax/nodes.go b/vendor/github.com/mvdan/sh/syntax/nodes.go
index 66e5e1ab..4ff5f07e 100644
--- a/vendor/github.com/mvdan/sh/syntax/nodes.go
+++ b/vendor/github.com/mvdan/sh/syntax/nodes.go
@@ -144,6 +144,10 @@ func (s *Stmt) End() Pos {
 
 // Command represents all nodes that are simple commands, which are
 // directly placed in a Stmt.
+//
+// These are *CallExpr, *IfClause, *WhileClause, *UntilClause,
+// *ForClause, *CaseClause, *Block, *Subshell, *BinaryCmd, *FuncDecl,
+// *ArithmCmd, *TestClause, *DeclClause, *LetClause, and *CoprocClause.
 type Command interface {
 	Node
 	commandNode()
@@ -162,7 +166,6 @@ func (*FuncDecl) commandNode()     {}
 func (*ArithmCmd) commandNode()    {}
 func (*TestClause) commandNode()   {}
 func (*DeclClause) commandNode()   {}
-func (*EvalClause) commandNode()   {}
 func (*LetClause) commandNode()    {}
 func (*CoprocClause) commandNode() {}
 
@@ -280,7 +283,7 @@ type ForClause struct {
 func (f *ForClause) Pos() Pos { return f.For }
 func (f *ForClause) End() Pos { return f.Done + 4 }
 
-// Loop represents all nodes that can be loops in a for clause.
+// Loop holds either *WordIter or *CStyleLoop.
 type Loop interface {
 	Node
 	loopNode()
@@ -342,6 +345,9 @@ func (w *Word) Pos() Pos { return w.Parts[0].Pos() }
 func (w *Word) End() Pos { return w.Parts[len(w.Parts)-1].End() }
 
 // WordPart represents all nodes that can form a word.
+//
+// These are *Lit, *SglQuoted, *DblQuoted, *ParamExp, *CmdSubst,
+// *ArithmExp, *ProcSubst, *ArrayExpr, and *ExtGlob.
 type WordPart interface {
 	Node
 	wordPartNode()
@@ -414,7 +420,8 @@ func (c *CmdSubst) End() Pos { return c.Right + 1 }
 type ParamExp struct {
 	Dollar, Rbrace Pos
 	Short          bool
-	Length, Excl   bool // TODO(mvdan): rename Excl in 2.0 (Indirect, etc)
+	Indirect       bool
+	Length         bool
 	Param          *Lit
 	Ind            *Index
 	Slice          *Slice
@@ -484,6 +491,9 @@ func (a *ArithmCmd) Pos() Pos { return a.Left }
 func (a *ArithmCmd) End() Pos { return a.Right + 2 }
 
 // ArithmExpr represents all nodes that form arithmetic expressions.
+//
+// These are *BinaryArithm, *UnaryArithm, *ParenArithm, *Lit, and
+// *ParamExp.
 type ArithmExpr interface {
 	Node
 	arithmExprNode()
@@ -492,20 +502,18 @@ type ArithmExpr interface {
 func (*BinaryArithm) arithmExprNode() {}
 func (*UnaryArithm) arithmExprNode()  {}
 func (*ParenArithm) arithmExprNode()  {}
-func (*Word) arithmExprNode()         {}
+func (*Lit) arithmExprNode()          {}
+func (*ParamExp) arithmExprNode()     {}
 
 // BinaryArithm represents a binary expression between two arithmetic
 // expression.
 //
-// If Op is any assign operator, X will be a *Word with a single *Lit
-// whose value is a valid name.
+// If Op is any assign operator, X will be a *Lit whose value is a valid
+// name.
 //
 // Ternary operators like "a ? b : c" are fit into this structure. Thus,
 // if Op == Quest, Y will be a *BinaryArithm with Op == Colon. Op can
 // only be Colon in that scenario.
-//
-// TODO(mvdan): we probably want to split up assigns in 2.0 (X would be
-// a *Lit) to simplify the rules here. Perhaps reuse the Assign type?
 type BinaryArithm struct {
 	OpPos Pos
 	Op    BinAritOperator
@@ -518,11 +526,7 @@ func (b *BinaryArithm) End() Pos { return b.Y.End() }
 // UnaryArithm represents an unary expression over a node, either before
 // or after it.
 //
-// If Op is Inc or Dec, X will be a *Word with a single *Lit whose value
-// is a valid name.
-//
-// TODO(mvdan): consider splitting up Inc/Dec like the assigns above in
-// 2.0.
+// If Op is Inc or Dec, X will be a *Lit whose value is a valid name.
 type UnaryArithm struct {
 	OpPos Pos
 	Op    UnAritOperator
@@ -584,6 +588,8 @@ func (t *TestClause) Pos() Pos { return t.Left }
 func (t *TestClause) End() Pos { return t.Right + 2 }
 
 // TestExpr represents all nodes that form arithmetic expressions.
+//
+// These are *BinaryTest, *UnaryTest, *ParenTest, and *Word.
 type TestExpr interface {
 	Node
 	testExprNode()
@@ -681,25 +687,6 @@ type ProcSubst struct {
 func (s *ProcSubst) Pos() Pos { return s.OpPos }
 func (s *ProcSubst) End() Pos { return s.Rparen + 1 }
 
-// EvalClause represents a Bash eval clause.
-//
-// This node will never appear when in PosixConformant mode.
-//
-// TODO(mvdan): EvalClause is actually pointless, as any non-trivial use
-// of eval will involve parsing the program at run-time. Remove in 2.0.
-type EvalClause struct {
-	Eval Pos
-	Stmt *Stmt
-}
-
-func (e *EvalClause) Pos() Pos { return e.Eval }
-func (e *EvalClause) End() Pos {
-	if e.Stmt != nil {
-		return e.Stmt.End()
-	}
-	return e.Eval + 4
-}
-
 // CoprocClause represents a Bash coproc clause.
 //
 // This node will never appear when in PosixConformant mode.
diff --git a/vendor/github.com/mvdan/sh/syntax/parser.go b/vendor/github.com/mvdan/sh/syntax/parser.go
index d97847a0..7e36f439 100644
--- a/vendor/github.com/mvdan/sh/syntax/parser.go
+++ b/vendor/github.com/mvdan/sh/syntax/parser.go
@@ -132,7 +132,7 @@ func (p *parser) word(parts []WordPart) *Word {
 	return w
 }
 
-func (p *parser) singleWps(wp WordPart) []WordPart {
+func (p *parser) wps(wp WordPart) []WordPart {
 	if len(p.wpsBatch) == 0 {
 		p.wpsBatch = make([]WordPart, 64)
 	}
@@ -142,15 +142,6 @@ func (p *parser) singleWps(wp WordPart) []WordPart {
 	return wps
 }
 
-func (p *parser) wps() []WordPart {
-	if len(p.wpsBatch) < 4 {
-		p.wpsBatch = make([]WordPart, 64)
-	}
-	wps := p.wpsBatch[:0:4]
-	p.wpsBatch = p.wpsBatch[4:]
-	return wps
-}
-
 func (p *parser) stmt(pos Pos) *Stmt {
 	if len(p.stmtBatch) == 0 {
 		p.stmtBatch = make([]Stmt, 16)
@@ -204,6 +195,7 @@ const (
 	arithmExprBrack
 	testRegexp
 	switchCase
+	paramName
 	paramExpName
 	paramExpInd
 	paramExpOff
@@ -218,7 +210,7 @@ const (
 		arithmExprBrack | allParamArith
 	allRbrack     = arithmExprBrack | paramExpInd
 	allParamArith = paramExpInd | paramExpOff | paramExpLen
-	allParamReg   = paramExpName | allParamArith
+	allParamReg   = paramName | paramExpName | allParamArith
 	allParamExp   = allParamReg | paramExpRepl | paramExpExp
 )
 
@@ -498,11 +490,6 @@ func (p *parser) invalidStmtStart() {
 }
 
 func (p *parser) getWord() *Word {
-	if p.tok == _LitWord {
-		w := p.word(p.singleWps(p.lit(p.pos, p.val)))
-		p.next()
-		return w
-	}
 	if parts := p.wordParts(); len(parts) > 0 {
 		return p.word(parts)
 	}
@@ -514,7 +501,7 @@ func (p *parser) getWordOrEmpty() *Word {
 	if len(parts) == 0 {
 		l := p.lit(p.pos, "")
 		l.ValueEnd = l.ValuePos // force Lit.Pos() == Lit.End()
-		return p.word(p.singleWps(l))
+		return p.word(p.wps(l))
 	}
 	return p.word(parts)
 }
@@ -536,9 +523,10 @@ func (p *parser) wordParts() (wps []WordPart) {
 			return
 		}
 		if wps == nil {
-			wps = p.wps()
+			wps = p.wps(n)
+		} else {
+			wps = append(wps, n)
 		}
-		wps = append(wps, n)
 		if p.spaced {
 			return
 		}
@@ -607,11 +595,10 @@ func (p *parser) wordPart() WordPart {
 			p.rune()
 			p.tok, p.val = _LitWord, string(r)
 		default:
-			if p.quote&allRegTokens != 0 {
-				p.advanceLitNone(r)
-			} else {
-				p.advanceLitOther(r)
-			}
+			old := p.quote
+			p.quote = paramName
+			p.advanceLitOther(r)
+			p.quote = old
 		}
 		pe.Param = p.getLit()
 		return pe
@@ -665,12 +652,7 @@ func (p *parser) wordPart() WordPart {
 		old := p.quote
 		p.quote = dblQuotes
 		p.next()
-		if p.tok == _LitWord {
-			q.Parts = p.singleWps(p.lit(p.pos, p.val))
-			p.next()
-		} else {
-			q.Parts = p.wordParts()
-		}
+		q.Parts = p.wordParts()
 		p.quote = old
 		if !p.got(dblQuote) {
 			p.quoteErr(q.Pos(), dblQuote)
@@ -803,7 +785,7 @@ func (p *parser) arithmExpr(ftok token, fpos Pos, level int, compact, tern bool)
 		}
 	case AddAssgn, SubAssgn, MulAssgn, QuoAssgn, RemAssgn, AndAssgn,
 		OrAssgn, XorAssgn, ShlAssgn, ShrAssgn, Assgn:
-		if w, ok := b.X.(*Word); !ok || !p.wordIdent(w) {
+		if l, ok := b.X.(*Lit); !ok || !validIdent(l.Value, p.bash()) {
 			p.posErr(b.OpPos, "%s must follow a name", b.Op.String())
 		}
 	}
@@ -822,14 +804,6 @@ func (p *parser) arithmExpr(ftok token, fpos Pos, level int, compact, tern bool)
 	return b
 }
 
-func (p *parser) wordIdent(w *Word) bool {
-	if len(w.Parts) != 1 {
-		return false
-	}
-	lit, ok := w.Parts[0].(*Lit)
-	return ok && validIdent(lit.Value, p.bash())
-}
-
 func (p *parser) arithmExprBase(compact bool) ArithmExpr {
 	var x ArithmExpr
 	switch p.tok {
@@ -843,7 +817,11 @@ func (p *parser) arithmExprBase(compact bool) ArithmExpr {
 	case addAdd, subSub:
 		ue := &UnaryArithm{OpPos: p.pos, Op: UnAritOperator(p.tok)}
 		p.next()
-		ue.X = p.followWordTok(token(ue.Op), ue.OpPos)
+		if lit := p.getLit(); lit == nil {
+			p.followErr(ue.OpPos, token(ue.Op).String(), "a literal")
+		} else {
+			ue.X = lit
+		}
 		return ue
 	case leftParen:
 		pe := &ParenArithm{Lparen: p.pos}
@@ -864,23 +842,27 @@ func (p *parser) arithmExprBase(compact bool) ArithmExpr {
 			p.followErrExp(ue.OpPos, ue.Op.String())
 		}
 		x = ue
+	case illegalTok, rightBrack, rightBrace, rightParen:
+	case _LitWord:
+		x = p.getLit()
+	case dollar, dollBrace:
+		x = p.wordPart().(*ParamExp)
 	case bckQuote:
 		if p.quote == arithmExprLet {
 			return nil
 		}
 		fallthrough
 	default:
-		if w := p.getWord(); w != nil {
-			// we want real nil, not (*Word)(nil) as that
-			// sets the type to non-nil and then x != nil
-			x = w
+		if arithmOpLevel(BinAritOperator(p.tok)) >= 0 {
+			break
 		}
+		p.curErr("arithmetic expressions must consist of names and numbers")
 	}
 	if compact && p.spaced {
 		return x
 	}
 	if p.tok == addAdd || p.tok == subSub {
-		if w, ok := x.(*Word); !ok || !p.wordIdent(w) {
+		if l, ok := x.(*Lit); !ok || !validIdent(l.Value, p.bash()) {
 			p.curErr("%s must follow a name", p.tok.String())
 		}
 		u := &UnaryArithm{
@@ -914,7 +896,7 @@ func (p *parser) paramExp() *ParamExp {
 		}
 	case exclMark:
 		if p.r != '}' {
-			pe.Excl = true
+			pe.Indirect = true
 			p.next()
 		}
 	}
@@ -1089,7 +1071,7 @@ func (p *parser) getAssign() *Assign {
 	start := p.lit(p.pos+1, p.val[p.asPos+1:])
 	if start.Value != "" {
 		start.ValuePos += Pos(p.asPos)
-		as.Value = p.word(p.singleWps(start))
+		as.Value = p.word(p.wps(start))
 	}
 	if p.next(); p.spaced {
 		return as
@@ -1108,7 +1090,7 @@ func (p *parser) getAssign() *Assign {
 			}
 		}
 		ae.Rparen = p.matched(ae.Lparen, leftParen, rightParen)
-		as.Value = p.word(p.singleWps(ae))
+		as.Value = p.word(p.wps(ae))
 	} else if !p.newLine && !stopToken(p.tok) {
 		if w := p.getWord(); w != nil {
 			if as.Value == nil {
@@ -1227,55 +1209,66 @@ preLoop:
 	return
 }
 
-func bashDeclareWord(s string) bool {
-	switch s {
-	case "declare", "local", "export", "readonly", "typeset", "nameref":
-		return true
-	}
-	return false
-}
-
 func (p *parser) gotStmtPipe(s *Stmt) *Stmt {
 	switch p.tok {
-	case leftParen:
-		s.Cmd = p.subshell()
-	case dblLeftParen:
-		s.Cmd = p.arithmExpCmd()
 	case _LitWord:
-		switch {
-		case p.val == "}":
-			p.curErr("%s can only be used to close a block", p.val)
-		case p.val == "{":
+		switch p.val {
+		case "{":
 			s.Cmd = p.block()
-		case p.val == "if":
+		case "if":
 			s.Cmd = p.ifClause()
-		case p.val == "while":
+		case "while":
 			s.Cmd = p.whileClause()
-		case p.val == "until":
+		case "until":
 			s.Cmd = p.untilClause()
-		case p.val == "for":
+		case "for":
 			s.Cmd = p.forClause()
-		case p.val == "case":
+		case "case":
 			s.Cmd = p.caseClause()
-		case p.bash() && p.val == "[[":
-			s.Cmd = p.testClause()
-		case p.bash() && bashDeclareWord(p.val):
-			s.Cmd = p.declClause()
-		case p.bash() && p.val == "eval":
-			s.Cmd = p.evalClause()
-		case p.bash() && p.val == "coproc":
-			s.Cmd = p.coprocClause()
-		case p.bash() && p.val == "let":
-			s.Cmd = p.letClause()
-		case p.bash() && p.val == "function":
-			s.Cmd = p.bashFuncDecl()
+		case "}":
+			p.curErr(`%s can only be used to close a block`, p.val)
+		case "]]":
+			if !p.bash() {
+				break
+			}
+			p.curErr(`%s can only be used to close a test`, p.val)
+		case "then":
+			p.curErr(`%q can only be used in an if`, p.val)
+		case "elif":
+			p.curErr(`%q can only be used in an if`, p.val)
+		case "fi":
+			p.curErr(`%q can only be used to end an if`, p.val)
+		case "do":
+			p.curErr(`%q can only be used in a loop`, p.val)
+		case "done":
+			p.curErr(`%q can only be used to end a loop`, p.val)
+		case "esac":
+			p.curErr(`%q can only be used to end a case`, p.val)
 		default:
+			if !p.bash() {
+				break
+			}
+			switch p.val {
+			case "[[":
+				s.Cmd = p.testClause()
+			case "declare", "local", "export", "readonly",
+				"typeset", "nameref":
+				s.Cmd = p.declClause()
+			case "coproc":
+				s.Cmd = p.coprocClause()
+			case "let":
+				s.Cmd = p.letClause()
+			case "function":
+				s.Cmd = p.bashFuncDecl()
+			}
+		}
+		if s.Cmd == nil {
 			name := p.lit(p.pos, p.val)
 			if p.next(); p.gotSameLine(leftParen) {
 				p.follow(name.ValuePos, "foo(", rightParen)
 				s.Cmd = p.funcDecl(name, name.ValuePos)
 			} else {
-				s.Cmd = p.callExpr(s, p.word(p.singleWps(name)))
+				s.Cmd = p.callExpr(s, p.word(p.wps(name)))
 			}
 		}
 	case bckQuote:
@@ -1291,6 +1284,10 @@ func (p *parser) gotStmtPipe(s *Stmt) *Stmt {
 			p.posErr(w.Pos(), "invalid func name")
 		}
 		s.Cmd = p.callExpr(s, w)
+	case leftParen:
+		s.Cmd = p.subshell()
+	case dblLeftParen:
+		s.Cmd = p.arithmExpCmd()
 	}
 	for !p.newLine && p.peekRedir() {
 		p.doRedirect(s)
@@ -1625,24 +1622,15 @@ func (p *parser) declClause() *DeclClause {
 	return ds
 }
 
-func (p *parser) evalClause() *EvalClause {
-	ec := &EvalClause{Eval: p.pos}
-	p.next()
-	ec.Stmt, _ = p.getStmt(false, false)
-	return ec
-}
-
 func isBashCompoundCommand(tok token, val string) bool {
 	switch tok {
 	case leftParen, dblLeftParen:
 		return true
 	case _LitWord:
 		switch val {
-		case "{", "if", "while", "until", "for", "case", "[[", "eval",
-			"coproc", "let", "function":
-			return true
-		}
-		if bashDeclareWord(val) {
+		case "{", "if", "while", "until", "for", "case", "[[",
+			"coproc", "let", "function", "declare", "local",
+			"export", "readonly", "typeset", "nameref":
 			return true
 		}
 	}
@@ -1668,12 +1656,12 @@ func (p *parser) coprocClause() *CoprocClause {
 		}
 		// name was in fact the stmt
 		cc.Stmt = p.stmt(cc.Name.ValuePos)
-		cc.Stmt.Cmd = p.call(p.word(p.singleWps(cc.Name)))
+		cc.Stmt.Cmd = p.call(p.word(p.wps(cc.Name)))
 		cc.Name = nil
 	} else if cc.Name != nil {
 		if call, ok := cc.Stmt.Cmd.(*CallExpr); ok {
 			// name was in fact the start of a call
-			call.Args = append([]*Word{p.word(p.singleWps(cc.Name))},
+			call.Args = append([]*Word{p.word(p.wps(cc.Name))},
 				call.Args...)
 			cc.Name = nil
 		}
@@ -1726,7 +1714,7 @@ func (p *parser) callExpr(s *Stmt, w *Word) *CallExpr {
 			return ce
 		case _LitWord:
 			ce.Args = append(ce.Args, p.word(
-				p.singleWps(p.lit(p.pos, p.val)),
+				p.wps(p.lit(p.pos, p.val)),
 			))
 			p.next()
 		case bckQuote:
diff --git a/vendor/github.com/mvdan/sh/syntax/printer.go b/vendor/github.com/mvdan/sh/syntax/printer.go
index dac6242f..3b214ea9 100644
--- a/vendor/github.com/mvdan/sh/syntax/printer.go
+++ b/vendor/github.com/mvdan/sh/syntax/printer.go
@@ -11,7 +11,14 @@ import (
 
 // PrintConfig controls how the printing of an AST node will behave.
 type PrintConfig struct {
-	Spaces int // 0 (default) for tabs, >0 for number of spaces
+	// Spaces dictates the indentation style. The default value of 0
+	// uses tabs, and any positive value uses that number of spaces.
+	Spaces int
+	// BinaryNextLine makes binary operators (such as &&, || and |)
+	// be at the start of a line if the statement that follows them
+	// is on a separate line. This means that the operator will come
+	// after an escaped newline.
+	BinaryNextLine bool
 }
 
 var printerFree = sync.Pool{
@@ -310,52 +317,7 @@ func (p *printer) wordPart(wp WordPart) {
 		p.nestedStmts(x.Stmts, x.Right)
 		p.sepTok(")", x.Right)
 	case *ParamExp:
-		if x.Short {
-			p.WriteByte('$')
-			p.WriteString(x.Param.Value)
-			break
-		}
-		p.WriteString("${")
-		switch {
-		case x.Length:
-			p.WriteByte('#')
-		case x.Excl:
-			p.WriteByte('!')
-		}
-		if x.Param != nil {
-			p.WriteString(x.Param.Value)
-		}
-		if x.Ind != nil {
-			p.WriteByte('[')
-			p.arithmExpr(x.Ind.Expr, false)
-			p.WriteByte(']')
-		}
-		if x.Slice != nil {
-			p.WriteByte(':')
-			if un, ok := x.Slice.Offset.(*UnaryArithm); ok {
-				if un.Op == Plus || un.Op == Minus {
-					// to avoid :+ and :-
-					p.WriteByte(' ')
-				}
-			}
-			p.arithmExpr(x.Slice.Offset, true)
-			if x.Slice.Length != nil {
-				p.WriteByte(':')
-				p.arithmExpr(x.Slice.Length, true)
-			}
-		} else if x.Repl != nil {
-			if x.Repl.All {
-				p.WriteByte('/')
-			}
-			p.WriteByte('/')
-			p.word(x.Repl.Orig)
-			p.WriteByte('/')
-			p.word(x.Repl.With)
-		} else if x.Exp != nil {
-			p.WriteString(x.Exp.Op.String())
-			p.word(x.Exp.Word)
-		}
-		p.WriteByte('}')
+		p.paramExp(x)
 	case *ArithmExp:
 		p.WriteString("$((")
 		p.arithmExpr(x.X, false)
@@ -381,6 +343,55 @@ func (p *printer) wordPart(wp WordPart) {
 	}
 }
 
+func (p *printer) paramExp(pe *ParamExp) {
+	if pe.Short {
+		p.WriteByte('$')
+		p.WriteString(pe.Param.Value)
+		return
+	}
+	p.WriteString("${")
+	switch {
+	case pe.Length:
+		p.WriteByte('#')
+	case pe.Indirect:
+		p.WriteByte('!')
+	}
+	if pe.Param != nil {
+		p.WriteString(pe.Param.Value)
+	}
+	if pe.Ind != nil {
+		p.WriteByte('[')
+		p.arithmExpr(pe.Ind.Expr, false)
+		p.WriteByte(']')
+	}
+	if pe.Slice != nil {
+		p.WriteByte(':')
+		if un, ok := pe.Slice.Offset.(*UnaryArithm); ok {
+			if un.Op == Plus || un.Op == Minus {
+				// to avoid :+ and :-
+				p.WriteByte(' ')
+			}
+		}
+		p.arithmExpr(pe.Slice.Offset, true)
+		if pe.Slice.Length != nil {
+			p.WriteByte(':')
+			p.arithmExpr(pe.Slice.Length, true)
+		}
+	} else if pe.Repl != nil {
+		if pe.Repl.All {
+			p.WriteByte('/')
+		}
+		p.WriteByte('/')
+		p.word(pe.Repl.Orig)
+		p.WriteByte('/')
+		p.word(pe.Repl.With)
+	} else if pe.Exp != nil {
+		p.WriteString(pe.Exp.Op.String())
+		p.word(pe.Exp.Word)
+	}
+	p.WriteByte('}')
+}
+
 func (p *printer) loop(loop Loop) {
 	switch x := loop.(type) {
 	case *WordIter:
@@ -405,8 +416,10 @@ func (p *printer) loop(loop Loop) {
 
 func (p *printer) arithmExpr(expr ArithmExpr, compact bool) {
 	switch x := expr.(type) {
-	case *Word:
-		p.word(x)
+	case *Lit:
+		p.WriteString(x.Value)
+	case *ParamExp:
+		p.paramExp(x)
 	case *BinaryArithm:
 		if compact {
 			p.arithmExpr(x.X, compact)
@@ -636,19 +649,28 @@ func (p *printer) command(cmd Command, redirs []*Redirect) (startRedirs int) {
 			p.incLevel()
 		}
 		_, p.nestedBinary = x.Y.Cmd.(*BinaryCmd)
-		if len(p.pendingHdocs) == 0 && x.Y.Pos() > p.nline {
-			p.bslashNewl()
-			p.indent()
-		}
-		p.spacedString(x.Op.String())
-		if p.anyCommentsBefore(x.Y.Pos()) {
-			p.wantSpace = false
-			p.WriteByte('\n')
-			p.indent()
-			p.incLines(p.comments[0].Pos())
-			p.commentsUpTo(x.Y.Pos())
-			p.WriteByte('\n')
-			p.indent()
+		if p.BinaryNextLine {
+			if len(p.pendingHdocs) == 0 && x.Y.Pos() > p.nline {
+				p.bslashNewl()
+				p.indent()
+			}
+			p.spacedString(x.Op.String())
+			if p.anyCommentsBefore(x.Y.Pos()) {
+				p.wantSpace = false
+				p.WriteByte('\n')
+				p.indent()
+				p.incLines(p.comments[0].Pos())
+				p.commentsUpTo(x.Y.Pos())
+				p.WriteByte('\n')
+				p.indent()
+			}
+		} else {
+			p.spacedString(x.Op.String())
+			if x.Y.Pos() > p.nline {
+				p.commentsUpTo(x.Y.Pos())
+				p.newline(0)
+				p.indent()
+			}
 		}
 		p.incLines(x.Y.Pos())
 		p.stmt(x.Y)
@@ -723,11 +745,6 @@ func (p *printer) command(cmd Command, redirs []*Redirect) (startRedirs int) {
 			p.word(w)
 		}
 		p.assigns(x.Assigns)
-	case *EvalClause:
-		p.spacedString("eval")
-		if x.Stmt != nil {
-			p.stmt(x.Stmt)
-		}
 	case *CoprocClause:
 		p.spacedString("coproc")
 		if x.Name != nil {
diff --git a/vendor/github.com/mvdan/sh/syntax/tokens.go b/vendor/github.com/mvdan/sh/syntax/tokens.go
index 26bf6a82..7bed2e02 100644
--- a/vendor/github.com/mvdan/sh/syntax/tokens.go
+++ b/vendor/github.com/mvdan/sh/syntax/tokens.go
@@ -316,16 +316,12 @@ const (
 	TsGeq
 	TsLss
 	TsGtr
-	AndTest = BinTestOperator(andAnd)
-	OrTest  = BinTestOperator(orOr)
-	// TODO(mvdan): == and != are pattern matches; use more
-	// appropriate names like TsMatch and TsNoMatch in 2.0
-	TsEqual  = BinTestOperator(equal)
-	TsNequal = BinTestOperator(nequal)
-	TsBefore = BinTestOperator(rdrIn)
-	TsAfter  = BinTestOperator(rdrOut)
-	// Deprecated: now parses as TsEqual
-	TsAssgn = BinTestOperator(assgn) // TODO(mvdan): remove in 2.0
+	AndTest   = BinTestOperator(andAnd)
+	OrTest    = BinTestOperator(orOr)
+	TsMatch   = BinTestOperator(equal)
+	TsNoMatch = BinTestOperator(nequal)
+	TsBefore  = BinTestOperator(rdrIn)
+	TsAfter   = BinTestOperator(rdrOut)
 )
 
 func (o RedirOperator) String() string   { return token(o).String() }
diff --git a/vendor/github.com/mvdan/sh/syntax/walk.go b/vendor/github.com/mvdan/sh/syntax/walk.go
index f2b6d3fd..f6c7ecfd 100644
--- a/vendor/github.com/mvdan/sh/syntax/walk.go
+++ b/vendor/github.com/mvdan/sh/syntax/walk.go
@@ -163,10 +163,6 @@ func Walk(node Node, f func(Node) bool) {
 		Walk(x.Pattern, f)
 	case *ProcSubst:
 		walkStmts(x.Stmts, f)
-	case *EvalClause:
-		if x.Stmt != nil {
-			Walk(x.Stmt, f)
-		}
 	case *CoprocClause:
 		if x.Name != nil {
 			Walk(x.Name, f)
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 6329c833..84e43985 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -51,16 +51,16 @@
 			"revisionTime": "2017-01-24T11:57:57Z"
 		},
 		{
-			"checksumSHA1": "1ZLAvHVYAS3kxaYI8OQiTBllqNU=",
+			"checksumSHA1": "ZjfvXVu+OyeRBysQ8uowAkPD/6o=",
 			"path": "github.com/mvdan/sh/interp",
-			"revision": "17e267b541e30baece16b7ddeae50822cc6a795f",
-			"revisionTime": "2017-04-24T11:31:08Z"
+			"revision": "faf782d3a498f50cfc6aa9071d04e6f1e82e8035",
+			"revisionTime": "2017-04-30T14:10:52Z"
 		},
 		{
-			"checksumSHA1": "4/7joITdf4wl+uoV8zDXgYqy2aw=",
+			"checksumSHA1": "RIR7FOsCR78SmOJOUsclJe9lvxo=",
 			"path": "github.com/mvdan/sh/syntax",
-			"revision": "17e267b541e30baece16b7ddeae50822cc6a795f",
-			"revisionTime": "2017-04-24T11:31:08Z"
+			"revision": "faf782d3a498f50cfc6aa9071d04e6f1e82e8035",
+			"revisionTime": "2017-04-30T14:10:52Z"
 		},
 		{
 			"checksumSHA1": "HUXE+Nrcau8FSaVEvPYHMvDjxOE=",