future-proofing-locals.rs

//@ edition:2018

#![allow(non_camel_case_types)]
#![allow(unused_imports)]

mod T {
    pub struct U;
}
mod x {
    pub struct y;
}

fn type_param<T>() {
    use T as _; //~ ERROR imports cannot refer to type parameters
    use T::U; //~ ERROR imports cannot refer to type parameters
    use T::*; //~ ERROR imports cannot refer to type parameters
}

fn self_import<T>() {
    use T; //~ ERROR imports cannot refer to type parameters
}

fn let_binding() {
    let x = 10;

    use x as _; //~ ERROR imports cannot refer to local variables
    use x::y; // OK
    use x::*; // OK
}

fn param_binding(x: u8) {
    use x; //~ ERROR imports cannot refer to local variables
}

fn match_binding() {
    match 0 {
        x => {
            use x; //~ ERROR imports cannot refer to local variables
        }
    }
}

fn nested<T>() {
    let x = 10;

    use {T as _, x}; //~ ERROR imports cannot refer to type parameters
                     //~| ERROR imports cannot refer to local variables
}

fn main() {}

// ferrocene-annotations: fls_9gprp17h6t1q
// Use Imports
//
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// Paths
//
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// Generic Parameters
//
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// Entities
//
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// Scopes
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// Binding Scopes
//
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// Generic Parameter Scope
//
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// Item Scope
//
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// Label Scope
//
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// Self Scope
//
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// Textual Macro Scope
//
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// Scope Hierarchy
//
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// Namespaces
//
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// Preludes
//
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// Shadowing
//
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// Resolution
//
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// Path Resolution
//
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// Simple Path Resolution