Function for_variable

pub fn for_variable(expr: &Expr, sema: &Semantics<'_, RootDatabase>) -> String

Suggest name of variable for given expression

NOTE: it is caller’s responsibility to guarantee uniqueness of the name. I.e. it doesn’t look for names in scope.

Current implementation

In current implementation, the function tries to get the name from the following sources:

• if expr is an argument to function/method, use parameter name
• if expr is a function/method call, use function name
• expression type name if it exists (E.g. (), fn() -> () or ! do not have names)
• fallback: var_name

It also applies heuristics to filter out less informative names

Currently it sticks to the first name found.