compiler bug:

[jnfoster]

Compiling the following program with p4c,

header_type ethernet_t {
    fields {
        dstAddr : 48;
        srcAddr : 48;
        etherType : 16;
    }
}

header ethernet_t ethernet;

parser parse_ethernet {
    extract(ethernet);
    return ingress;
}

parser start {
    return parse_ethernet;
}

action my_drop() {
    drop();
}

action forward(port) {
    modify_field(standard_metadata.egress_port, port);
}

table dmac {
    reads {
        ethernet.dstAddr : exact;
    }
    actions {forward; drop;}
    size : 512;
}

control ingress{
    apply(dmac);
}

crashes with a sensible error message, then a core dump:

error: Cannot locate action drop
terminate called after throwing an instance of 'Util::CompilerBug'
  what():  COMPILER BUG: ../ir/id.h:38
Identifier with no name

Aborted (core dumped)

[jnfoster]

Just pulled and verified that this is fixed. Thanks @ChrisDodd!