Pin the reference-draw overlap to naming the disagreement and the read a drawGroup goes on

inline_test.go

@@ -108,8 +108,8 @@ func TestFakeTemplateErrors(t *testing.T) {
 		{`name: {/no.such.path}`, "no entry"},
 		{`name: {..nope}`, "write {/nope}"},
 		{`{"format":"x"}`, "is a string"},
-		{`{/misc.territory} {/misc.territory.alpha2}`, "and {/misc.territory.alpha2} share one reference draw, one read whole and one by a path; name the fields you want instead, or draw them apart with a drawGroup"},
+		{`{/misc.territory} {/misc.territory.alpha2}`, "{/misc.territory} renders its own draw of what {/misc.territory.alpha2} reads a path through; name the fields you want instead, or move {/misc.territory.alpha2} into a field with a drawGroup"},
-		{`{"format":"{/misc.territory.alpha2} {x}","x":"{/misc.territory}"}`, "share one reference draw"},
+		{`{"format":"{/misc.territory.alpha2} {x}","x":"{/misc.territory}"}`, "renders its own draw of what"},
 		{`{"format":"{/misc.territory.alpha2}","drawGroup":"g"}`, "nothing can reference"},
 	} {
 		_, err := f.FakeTemplate(c.input)

record_test.go

@@ -220,7 +220,7 @@ func TestRecordRejectsOverlappingReferenceColumns(t *testing.T) {
 		{"a column reaching back through another category", `{"format":"","whole":"{/mid}","inner":"{/cat.a.b}"}`},
 	} {
 		_, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{"cat": cat, "mid": mid, "row": c.row})))
-		if err == nil || !strings.Contains(err.Error(), "share one reference draw") {
+		if err == nil || !strings.Contains(err.Error(), "renders its own draw of what") {
 			t.Errorf("%s: New = %v, want the overlap refused at load, the way one format is", c.name, err)
 			continue
 		}
@@ -236,7 +236,7 @@ func TestInlineRecordRejectsOverlappingColumns(t *testing.T) {
 	})
 	f := newGenerator(t, dir, WithSeed(1))
 	_, err := f.FakeRecordTemplate(`{"format":"","whole":"{/cat.a}","inner":"{/cat.a.b}"}`)
-	if err == nil || !strings.Contains(err.Error(), "share one reference draw") {
+	if err == nil || !strings.Contains(err.Error(), "renders its own draw of what") {
 		t.Fatalf("inline record over an overlapping pair = %v, want the inline entry point to refuse it too", err)
 	}
 }

reference_test.go

@@ -271,10 +271,14 @@ func TestReferenceOverlapIsRejected(t *testing.T) {
 		"a bare reference beside a path into what it never renders": `{"format":"{a} {b}","a":"{/cat}","b":"{/cat.p.first}"}`,
 	} {
 		_, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{"cat": cat, "row": row})))
-		if err == nil || !strings.Contains(err.Error(), "share one reference draw") {
+		if err == nil || !strings.Contains(err.Error(), "renders its own draw of what") {
 			t.Errorf("%s: New = %v, want the overlap rejected", name, err)
 		}
 	}
+	_, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{"cat": cat, "row": `{"format":"{a} {b}","a":"{/cat}","b":"{/cat.p.first}"}`})))
+	if err == nil || !strings.HasSuffix(err.Error(), "or give {b} a drawGroup") {
+		t.Errorf("New = %v, want the drawGroup named on the path's field", err)
+	}
 	// A sibling path and a reference into the level it holds are the same overlap,
 	// and the reference reaches it from a category row renders.
 	if _, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{
@@ -283,11 +287,13 @@ func TestReferenceOverlapIsRejected(t *testing.T) {
 	}))); err == nil || !strings.Contains(err.Error(), "by a second route") {
 		t.Errorf("New = %v, want a sibling path beside a reference into it rejected", err)
 	}
-	if _, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{
+	for _, row := range []string{
-		"cat": cat,
+		`{"format":"{a} {b}","a":{"format":"{/cat.p}","drawGroup":"g"},"b":"{/cat.p.first}"}`,
-		"row": `{"format":"{a} {b}","a":{"format":"{/cat.p}","drawGroup":"g"},"b":"{/cat.p.first}"}`,
+		`{"format":"{a} {b}","a":"{/cat}","b":{"format":"{/cat.p.first}","drawGroup":"g"}}`,
-	}))); err != nil {
+	} {
-		t.Errorf("New = %v, want a level and a path into it accepted in groups of their own", err)
+		if _, err := New(WithoutShippedData(), WithDataPath(writeData(t, map[string]string{"cat": cat, "row": row}))); err != nil {
+			t.Errorf("New(%s) = %v, want a level and a path into it accepted in groups of their own", row, err)
+		}
 	}
 }
 
@@ -413,7 +419,7 @@ func TestSpellingsOfOneReferenceAreOneLevel(t *testing.T) {
 		"sv_SE/person": person,
 		"sv_SE/mail":   `"{.person} <{/sv_SE.person.first}>"`,
 	})))
-	if err == nil || !strings.Contains(err.Error(), "share one reference draw") || !strings.Contains(err.Error(), "{.person}") {
+	if err == nil || !strings.Contains(err.Error(), "renders its own draw of what") || !strings.Contains(err.Error(), "{.person}") {
 		t.Errorf("New = %v, want the bare spelling rejected beside the path spelling", err)
 	}
 	dir := writeData(t, map[string]string{

struct_test.go

@@ -296,7 +296,7 @@ func TestFakeStructErrors(t *testing.T) {
 		{&struct {
 			A string `fake:"trip.leg"`
 			B string `fake:"trip.leg.to"`
-		}{}, "share one reference draw"},
+		}{}, "renders its own draw of what"},
 		{&struct {
 			Trip struct {
 				A int `fake:"{digits(3)}"`

table_test.go

@@ -367,8 +367,8 @@ func TestTableSelectorInAReference(t *testing.T) {
 
 func TestTableSelectionFences(t *testing.T) {
 	rejected := map[string]struct{ json, want string }{
-		"bare beside a path":                  {`"{/region} {/region.name}"`, "share one reference draw"},
+		"bare beside a path":                  {`"{/region} {/region.name}"`, "renders its own draw of what"},
-		"bare beside a linked path":           {`"{/region} {/locality.name}"`, "share one reference draw"},
+		"bare beside a linked path":           {`"{/region} {/locality.name}"`, "renders its own draw of what"},
 		"selected beside unselected":          {`"{/region[12].municipality.name} {/municipality.code}"`, "{/region[12].municipality.code}"},
 		"relative selected beside unselected": {`"{.region[12].municipality.name} {.municipality.code}"`, "{.region[12].municipality.code}"},
 		"two selections":                      {`"{/region[12].name} {/region[14].name}"`, "drawGroup"},
@@ -1120,7 +1120,7 @@ func TestCellReadsMeetWhereTheRenderPairsTheRows(t *testing.T) {
 		"region.json":       `{"format":"{name}={note}","rows":"region.tsv","key":"code","name":"name","weight":"population"}`,
 		"x.json":            `"{/region}|{/municipality}"`,
 	})
-	if _, err := New(WithoutShippedData(), WithDataPath(writeFiles(t, whole)), WithSeed(1)); err == nil || !strings.Contains(err.Error(), "share one reference draw") {
+	if _, err := New(WithoutShippedData(), WithDataPath(writeFiles(t, whole)), WithSeed(1)); err == nil || !strings.Contains(err.Error(), "renders its own draw of what") {
 		t.Fatalf("New = %v, want the two drawn rows held to one draw of addr", err)
 	}
 	nested := with(whole, map[string]string{