Why Does Using a Struct in a For Loop Initializer Cause a Syntax Error in Go?

Struct in for Loop Initializer

In a for loop initializer, using a struct expression can lead to a syntax error during compile time. This is because the compiler can become confused when trying to interpret the opening brace of the struct as part of either a composite literal or the for block.

To avoid this error and make the intention clear, parentheses can be placed around the composite literal. For example:

for r := (Request{}); r.err == nil; r.id++ {
    r.line, r.err = input.ReadSlice(0x0a)
    channel <- r
}

Here, the parentheses explicitly define the composite literal, allowing the compiler to correctly interpret the code.

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