I have this typedef in Plan 9
typedef struct Mach Mach;

a global
Mach *m;

and functions:
a(...){
...
m->whatever = x;
...
}

I want to add some code after the {
+Mach *m=machp();

I.e. for any function that uses the "global" (it's not really that, it's a
bit more complex) I want to add a local variable that is initialized.

My efforts so far have failed badly.

ron
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