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grammar ANF;
aexp
: IDENT
| NUMBER
| aexp '+' aexp
| aexp '-' aexp
| aexp '*' aexp
| aexp '/' aexp
| '(' IDENT ':' cexp ')'
;
funcall
: IDENT '(' aexp (',' aexp)* ')'
| aexp
;
cexp
: 'let' IDENT '=' funcall 'in' cexp
| funcall
;
IDENT: Letter (Letter | Digit)*;
NUMBER: Digit+;
fragment Letter: 'A' .. 'Z' | 'a' .. 'z';
fragment Digit: '0'..'9';
WS: [ \t\n\r]+ -> skip;
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