From the course: Rust Essential Training

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The borrow checker

The borrow checker - Rust Tutorial

From the course: Rust Essential Training

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The borrow checker

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- [Instructor] Earlier in this course, when discussing references and borrowing, we saw that the Rust compiler can detect when your program tries to use a reference, after the thing at points do has gone out of scope. That's known as a dangling reference. Consider the example program shown here, which declares a variable named propellant on line two without initializing it, who's scope is the body of the main function. After that, a pair of curly braces enclose the code on lines four through six, which therefore exists in an inner sub scope. Those three lines initialize a new string variable named rp1, assign the propellant variable a reference to that new rp1 string and then print propellant. Since everything from the creation of rp1 to its final use takes place within that inner code block, if I run this program, everything works fine and we get the output message that propellant is rp1. However, if we move that final…

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