solver: ensure each ref in the result map is evaluated

There was a typo in d709afdb96.

Signed-off-by: Justin Chadwell <me@jedevc.com>

frontend/dockerfile/dockerfile_test.go

@@ -112,6 +112,7 @@ var allTests = integration.TestFuncs(
 	testCacheMultiPlatformImportExport,
 	testOnBuildCleared,
 	testFrontendUseForwardedSolveResults,
+	testFrontendEvaluate,
 	testFrontendInputs,
 	testErrorsSourceMap,
 	testMultiArgs,
@@ -4902,6 +4903,47 @@ COPY foo foo2
 	require.Equal(t, dt, []byte("data"))
 }
 
+func testFrontendEvaluate(t *testing.T, sb integration.Sandbox) {
+	integration.SkipOnPlatform(t, "windows")
+	c, err := client.New(sb.Context(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	dockerfile := []byte(`
+FROM scratch
+COPY badfile /
+`)
+	dir := integration.Tmpdir(t, fstest.CreateFile("Dockerfile", dockerfile, 0600))
+
+	frontend := func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+		_, err := c.Solve(ctx, gateway.SolveRequest{
+			Frontend: "dockerfile.v0",
+			Evaluate: true,
+		})
+		require.ErrorContains(t, err, `"/badfile": not found`)
+
+		_, err = c.Solve(ctx, gateway.SolveRequest{
+			Frontend: "dockerfile.v0",
+			FrontendOpt: map[string]string{
+				"platform": "linux/amd64,linux/arm64",
+			},
+			Evaluate: true,
+		})
+		require.ErrorContains(t, err, `"/badfile": not found`)
+
+		return nil, nil
+	}
+
+	_, err = c.Build(sb.Context(), client.SolveOpt{
+		Exports: []client.ExportEntry{},
+		LocalDirs: map[string]string{
+			dockerui.DefaultLocalNameDockerfile: dir,
+			dockerui.DefaultLocalNameContext:    dir,
+		},
+	}, "", frontend, nil)
+	require.NoError(t, err)
+}
+
 func testFrontendInputs(t *testing.T, sb integration.Sandbox) {
 	integration.SkipOnPlatform(t, "windows")
 	f := getFrontend(t, sb)

solver/llbsolver/provenance.go

@@ -180,7 +180,7 @@ func (b *provenanceBridge) Solve(ctx context.Context, req frontend.SolveRequest,
 	}
 	if req.Evaluate {
 		err = res.EachRef(func(ref solver.ResultProxy) error {
-			_, err := res.Ref.Result(ctx)
+			_, err := ref.Result(ctx)
 			return err
 		})
 	}