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#[derive(Debug, Fail)]
pub enum YolkError {
#[fail(display = "invalid syntax: {}", msg)]
InvalidSyntax { msg: String },
#[fail(display = "cannot import existing variable: {}", var)]
ImportExisting { var: String },
#[fail(display = "cannot import keyword: {}", var)]
ImportKeyword { var: String },
#[fail(display = "cannot define existing function: {}", func)]
DefineExisting { func: String },
#[fail(display = "cannot define keyword: {}", func)]
DefineKeyword { func: String },
#[fail(display = "cannot assign to existing variable: {}", var)]
AssignExisting { var: String },
#[fail(display = "cannot assign to keyword: {}", var)]
AssignKeyword { var: String },
#[fail(display = "name conflict with variable: {}", var)]
AssignConflict { var: String },
#[fail(display = "undefined function: {}", func)]
UndefinedFunction { func: String },
#[fail(display = "undefined variable {}", var)]
UndefinedVariable { var: String },
#[fail(display = "duplicate parameters in function: {}", func)]
DuplicateParams { func: String },
#[fail(display = "recursive call in function: {}", func)]
RecursiveCall { func: String },
#[fail(display = "wrong number of arguments provided for function: {}", func)]
WrongNumberOfArgs { func: String },
#[fail(display = "mismatched array lengths")]
MismatchedArrays,
#[fail(display = "cannot nest arrays")]
NestedArrays,
}