Error Syntax Error Inserting Val
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is produced by ML-Yacc, and it uses a lexer generated by ML-Lex. The parser uses an error repair scheme that attempts to get a error: unbound structure sml correct parse by deleting, adding, or substituting tokens. The parser produces error error: syntax error: inserting equalop messages like: - fun + => 3; = ; stdIn:2.2-2.7 Error: syntax error: deleting DARROW INT SEMICOLON
Sml And
This error message indicates how the parser attempted to "repair" the input, and in this case indicates that the parser doesn't like the "=> 3;" that follow the plus
Sml Exceptions
sign. For more detailed discussion of syntax errors generated by the parser, see the explanations of errors [76] through [79] below. Compiler Errors Error messages that start with "Error: Compiler bug: indicate that an unexpected situation has been encountered by the compiler. Example: Error: Compiler bug: ModuleUtil: getStr: bad entity Such a message indicates a bug in the sml case statement compiler, and it should be reported to sml-bugs@research.bell.labs.com, with self-contained code to reproduce the message if possible. Most such messages will be secondary error messages, meaning that they occur immediately following a normal (i.e. non "Compiler Bug") error message. Secondary errors typically occur when a primary error disrupts the internal state or data structures of the compiler, and the corrupted state then causes further failures. The SML/NJ compiler is pretty good at recovering from errors and failing gracefully, so secondary Compiler Bug errors are rare. General Errors In the example code shown for the following errors, the interactive prompt symbols have been omitted to improve readability. The user input is shown in regular font, with the compiler responses in italics. [1] argument of raise is not an exception The expression following the raise keyword should evaluate to an exception value, i.e. a value of type exn. In this case, the value has some other, inappropriate type. E.g.: raise 3; stdIn:16.7 Error: argument of raise is not an exception [literal] raised: int in expressi
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Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community sml pattern matching Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up ERROR: Inserting sml let EQUALOP up vote 1 down vote favorite Hi can someone help me figure why i get the ERROR: Inserting EQUALOP for the following code? fun generator inchan outchan n = if n>0 then (let fun loop () = val c = recv(outchan) val http://flint.cs.yale.edu/cs421/smlnj/doc/errors.html _ = send (inchan, c) in (loop ();(generator inchan outchan (n-1))) end) else inchan; sml ml share|improve this question edited Dec 5 '13 at 23:59 qaphla 3,68631126 asked Dec 5 '13 at 23:56 user2948246 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote You enter a let statement, and then define a function. However, inside that function, you seem to want to define more variables. To do this, you need another let statement. Without it, you will get a syntax http://stackoverflow.com/questions/20413318/error-inserting-equalop error like this. Try using this instead: fun loop () = send (inchan, recv (outchan)) Or, if you want the separate lines for more clarity: fun loop () = let val c = recv (outchan) in send (inchan, c) end Or maybe fun loop () = let val c = recv (outchan) val _ = send (inchan, c) in () end share|improve this answer answered Dec 6 '13 at 0:03 qaphla 3,68631126 Using this generator code how do i recursively create new mailboxes such that the outchan of the first is the inchan of the next? –user2948246 Dec 6 '13 at 16:59 I have no idea what it is you're trying to do, because you haven't explained it. This code is a replacement for your loop function, and nothing else. If another part of the code isn't working, you should ask another question. –qaphla Dec 6 '13 at 17:48 I have to implement a generating function that will generate a stream of mailboxes. The generating function will be parameterized by two channels, the in and out channels for the first mailbox, and integer dictating how many mailboxes to generate. This function should be recursive and allocate new channels. On the recursive invocation of generator the previous out channel should be the in channel for the next mailbox. A new channel should be allocated as the new out channel. I have written a code of the generator function but i think theres an infinite loop because it doesnt stop. –user
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The intepreter prompt is a dash. At this prompt you can: evaluate an expression; EX: (note: the dash is the interpreter prompt) - 2 + 3; val it = 5 : int <== interpreter response define a function or a value: EX: - fun inc x = x + 1; val inc = fn : int -> int - inc 42; val it = 43 : int - val xyz = inc (inc 55); val xyz = 57 : int - inc (2 * xyz); val it = 115 : int load a file of "val" and "fun" definitions: EX: - use "testfile.sml"; [opening testfile.sml] val inc = fn : int -> int val it = () : unit comments text between (* and *) is a comment, thus ignored; Showing large data structures: To control the amount of information that is printed, execute one of: System.Control.Print.printDepth := 25; System.Control.Print.printLength := 500; Common problems you might have: syntax errors EX: - fun inc x) = x + 1; std_in:3.10 Error: syntax error found at RPAREN type errors EX: - fun f (x::xs) = x mod xs; std_in:0.0-0.0 Error: operator and operand don't agree (tycon mismatch) operator domain: int * int operand: int * int list in expression: mod (x,xs) Here we tried to do a "mod" operation with a list (xs). The type checker is telling us that the mod operator takes two integers (int * int) but that we applied it to an int and an int list (int * int list). overloading ambiguity EX: - fun square x = x * x; std_in:0.0 Error: overloaded variable cannot be resolved: * Here the system cannot decide whether we intend this function to be multiplying two integers or two reals, since the "*" operator is overloaded. We can fix this by telling it the type of its return value: - fun square x : int = x * x; val square = fn : int -> int Now it understands that we intend integer multiplication. Basic types and operations: type values operators int ...~2, ~1, 0, 1, 2... ~, +, -, *, div, mod <, >, <=, >=, =, <> booltrue, falsenot, and, or, andalso, orelse string"abc", "z", etcsize, ^ real0.243, etc~, +, -, *, /,<, >, <=, >=, =, <>,sin, exp, sqrt, etc type converter functions: real : int -> real floor : real -> int Structured types (built in) type constructors operations list ::, nil hd, tl, =, pattern matches tuples (a), (a,3), (a,3,"x") ... pattern matche