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PROG ::= INSTR*
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INSTR ::=
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| DIR
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| EXPR semicolon
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| FUNDECL
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| return EXPR semicolon
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| EXTERN semicolon
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EXTERN ::= extern fun ident opar PARAMS cpar RET
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FUNDECL ::= fun ident opar PARAMS cpar RET BLOCK
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PARAMS ::= (ident type? (comma ident type?)*)
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RET ::= type?
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BLOCK ::= obrace INSTR* cbrace
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DIR ::= hash ident EXPR (as ident)?
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EXPR ::=
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| ADDSUB
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ADDSUB ::= MULDIVMOD ((add|sub) MULDIVMOD)*
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MULDIVMOD ::= LITERAL ((mul|div|mod) LITERAL)*
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LITERAL ::=
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| ident
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| int
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| CALL
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| NS
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CALL ::= ident opar ARGS cpar
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ARGS ::= (EXPR (comma EXPR)*)?
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NS ::= ident (dot (ident|CALL))+
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