Compile a format in format.go

format.go

@@ -434,6 +434,16 @@ func (c *formatOps) field(tok formatToken, refs map[string]refBinding) {
 	c.ops = append(c.ops, op{formatToken: tok, arms: arms})
 }
 
+// compileFormat compiles a format into ops, and applies the fences that need the
+// compiled reads.
+func compileFormat(toks []formatToken, refs map[string]refBinding) (formatOps, error) {
+	c := compileOps(toks, refs)
+	if err := checkNoOverlap(c); err != nil {
+		return c, err
+	}
+	return c, checkNoRepeatedRead(c)
+}
+
 // compileOps compiles a parsed format. Call checkTokens first: it is what proves
 // every token valid.
 func compileOps(toks []formatToken, refs map[string]refBinding) formatOps {