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Compiler hangs when compiling large string concatenation #24989

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Compiler hangs when compiling large string concatenation#24989
@zeitbit

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@zeitbit
zeitbit
opened on Jun 10, 2025

Nim Compiler Version 2.3.1 [Windows: amd64]
Compiled at 2025-06-09.

const CRLF = "\r\n"

proc Test(): string =
    let text = "---------------------" &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF &
    "----------" & "----------" & CRLF

    text

echo Test()

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