Module error 

Structs

BreakOutsideLoop

Cannot use break outside of a loop.

CompoundAssignmentInHeader

A compound assignment operator was used within a function header.

ContinueOutsideLoop

Cannot use continue outside of a loop.

DefaultArgumentNotLast

Default arguments must be placed at the end of the argument list.

EmptyRadixLiteral

No number was provided in a radix literal.

ExpectedEof

The end of the source code was expected, but something else was found.

ExpectedExpr

Expected to see a certain kind of expression here.

ExpectedSymbolName

Encountered a keyword when a symbol name was expected.

InvalidAssignmentLhs

The left-hand-side of an assignment was not a valid symbol or function header.

InvalidCompoundAssignmentLhs

The left-hand-side of a compound assignment operator cannot be a function header.

InvalidRadixBase

The base used in radix notation was out of the allowed range.

InvalidRadixDigit

An invalid digit was used in a radix literal.

MissingIfBranch

Missing then or else branch in an if expression.

MissingIfKeyword

Missing then or else keyword in an if expression.

NonFatal

An intentionally useless error. This should only be used for non-fatal errors, as it contains no useful information.

OfOutsideSumProduct

Cannot use of keyword outside of a sum or product expression.

ReturnOutsideFunction

Cannot use return outside of a function.

ThenOutsideIfWhileFor

Cannot use then keyword outside of an if, while or for expression.

TooManyDerivatives

There were too many derivatives in prime notation.

UnclosedParenthesis

A parenthesis was not closed.

UnexpectedEoExpr

Unexpected end of an expression.

UnexpectedEof

The end of the source code was reached unexpectedly.

UnexpectedToken

An unexpected token was encountered.