3 files changed, 59 insertions, 7 deletions
diff --git a/src/go/printer/nodes.go b/src/go/printer/nodes.go
index 6e26f9a63..e52236ddc 100644
--- a/src/go/printer/nodes.go
+++ b/src/go/printer/nodes.go
@@ -163,8 +163,8 @@ func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exp
 	size := 0
 
 	// print all list elements
+	prevLine := prev.Line
 	for i, x := range list {
-		prevLine := line
 		line = p.lineFor(x.Pos())
 
 		// determine if the next linebreak, if any, needs to use formfeed:
@@ -207,8 +207,8 @@ func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exp
 			}
 		}
 
+		needsLinebreak := 0 < prevLine && prevLine < line
 		if i > 0 {
-			needsLinebreak := prevLine < line && prevLine > 0 && line > 0
 			// use position of expression following the comma as
 			// comma position for correct comment placement, but
 			// only if the expression is on the same line
@@ -232,16 +232,20 @@ func (p *printer) exprList(prev0 token.Pos, list []ast.Expr, depth int, mode exp
 			}
 		}
 
-		if isPair && size > 0 && len(list) > 1 {
-			// we have a key:value expression that fits onto one line and
-			// is in a list with more then one entry: use a column for the
-			// key such that consecutive entries can align if possible
+		if len(list) > 1 && isPair && size > 0 && needsLinebreak {
+			// we have a key:value expression that fits onto one line
+			// and it's not on the same line as the prior expression:
+			// use a column for the key such that consecutive entries
+			// can align if possible
+			// (needsLinebreak is set if we started a new line before)
 			p.expr(pair.Key)
 			p.print(pair.Colon, token.COLON, vtab)
 			p.expr(pair.Value)
 		} else {
 			p.expr0(x, depth)
 		}
+
+		prevLine = line
 	}
 
 	if mode&commaTerm != 0 && next.IsValid() && p.pos.Line < next.Line {
diff --git a/src/go/printer/testdata/declarations.golden b/src/go/printer/testdata/declarations.golden
index a27f21fc8..9acd41b7d 100644
--- a/src/go/printer/testdata/declarations.golden
+++ b/src/go/printer/testdata/declarations.golden
@@ -593,7 +593,7 @@ var (
 )
 
 func _() {
-	var privateKey2 = &Block{Type:	"RSA PRIVATE KEY",
+	var privateKey2 = &Block{Type: "RSA PRIVATE KEY",
 		Headers:	map[string]string{},
 		Bytes: []uint8{0x30, 0x82, 0x1, 0x3a, 0x2, 0x1, 0x0, 0x2,
 			0x41, 0x0, 0xb2, 0x99, 0xf, 0x49, 0xc4, 0x7d, 0xfa, 0x8c,
@@ -698,6 +698,29 @@ var _ = T4{
 	c:	z,
 }
 
+// no alignment of map composite entries if they are not the first entry on a line
+var _ = T{0: 0}	// not aligned
+var _ = T{0: 0,	// not aligned
+	1:	1,				// aligned
+	22:	22,				// aligned
+	333:	333, 1234: 12, 12345: 0,	// first on line aligned
+}
+
+// test cases form issue 8685
+// not aligned
+var _ = map[int]string{1: "spring", 2: "summer",
+	3:	"autumn", 4: "winter"}
+
+// not aligned
+var _ = map[string]string{"a": "spring", "b": "summer",
+	"c":	"autumn", "d": "winter"}
+
+// aligned
+var _ = map[string]string{"a": "spring",
+	"b":	"summer",
+	"c":	"autumn",
+	"d":	"winter"}
+
 func _() {
 	var _ = T{
 		a,	// must introduce trailing comma
diff --git a/src/go/printer/testdata/declarations.input b/src/go/printer/testdata/declarations.input
index d9951d386..45beec25f 100644
--- a/src/go/printer/testdata/declarations.input
+++ b/src/go/printer/testdata/declarations.input
@@ -715,6 +715,31 @@ var _ = T4{
 }
 
 
+// no alignment of map composite entries if they are not the first entry on a line
+var _ = T{0: 0} // not aligned
+var _ = T{0: 0, // not aligned
+	1: 1, // aligned
+	22: 22, // aligned
+	333: 333, 1234: 12, 12345: 0, // first on line aligned
+}
+
+
+// test cases form issue 8685
+// not aligned
+var _ = map[int]string{1: "spring", 2: "summer",
+					3:             "autumn", 4: "winter"}
+
+// not aligned
+var _ = map[string]string{"a": "spring", "b": "summer",
+	"c": "autumn", "d": "winter"}
+
+// aligned
+var _ = map[string]string{"a": "spring",
+"b": "summer",
+	"c": "autumn",
+"d": "winter"}
+
+
 func _() {
 	var _ = T{
 		a,	// must introduce trailing comma