[master] 63fb2ec Polish an error message

[Poul-Henning Kamp]

commit 63fb2ecb5231b7123153a379d292722ee99ea3fb
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Wed Jan 31 07:51:01 2018 +0000

    Polish an error message

diff --git a/lib/libvcc/vcc_action.c b/lib/libvcc/vcc_action.c
index 3724cdc..9c77516 100644
--- a/lib/libvcc/vcc_action.c
+++ b/lib/libvcc/vcc_action.c
@@ -135,6 +135,7 @@ parse_set(struct vcc *tl)
 	} else {
 		vcc_Expr(tl, fmt);
 	}
+	ERRCHK(tl);
 	tl->indent -= INDENT;
 	Fb(tl, 1, ");\n");
 	SkipToken(tl, ';');
diff --git a/lib/libvcc/vcc_expr.c b/lib/libvcc/vcc_expr.c
index 2cf80e0..e4d2d20 100644
--- a/lib/libvcc/vcc_expr.c
+++ b/lib/libvcc/vcc_expr.c
@@ -692,6 +692,10 @@ vcc_expr4(struct vcc *tl, struct expr **e, vcc_type_t fmt)
 		    "Symbol type (%s) can not be used in expression.\n",
 		    VCC_SymKind(tl, sym));
 		vcc_ErrWhere(tl, tl->t);
+		if (sym->def_b != NULL) {
+			VSB_printf(tl->sb, "That symbol was defined here:\n");
+			vcc_ErrWhere(tl, sym->def_b);
+		}
 		return;
 	case CSTR:
 		assert(fmt != VOID);