Bug: Multi-line f-string concatenation not converted

[swernerx]

Description

Python allows implicit string concatenation across multiple lines, including f-strings. This pattern is not being properly converted to a single template literal.

Python Input

fmt = (f'Machine parameters for {dtype}\n'
       f'---------------------------------------------------------------\n'
       f'precision = {precision}   resolution = {resolution}\n'
       f'machep = {machep}   eps = {eps}\n')

Current Output (v1.3.3)

let fmt = (f'Machine parameters for {this.dtype}\n'
        f'---------------------------------------------------------------\n'
        f'precision = {precision}   resolution = {resolution}\n'
        f'machep = {machep}   eps =        {eps}\n');
// ❌ INVALID - Multiple f-strings not concatenated!

Expected Output

const fmt = \`Machine parameters for \${dtype}
---------------------------------------------------------------
precision = \${precision}   resolution = \${resolution}
machep = \${machep}   eps = \${eps}
\`;

Or with explicit concatenation:

const fmt = 
  \`Machine parameters for \${dtype}\n\` +
  \`---------------------------------------------------------------\n\` +
  \`precision = \${precision}   resolution = \${resolution}\n\` +
  \`machep = \${machep}   eps = \${eps}\n\`;

Priority

🔴 Critical - Causes ~100+ errors in NumPy migration

Files Affected

• numpy/_core/getlimits.py (multiple occurrences)
• numpy/_core/_internal.py
• Other files with multi-line f-strings

[swernerx]

Bug still exists in v1.3.3!

fmt = (f'Line 1: {value1}\n'
       f'Line 2: {value2}\n')

Current output:

let fmt = (f'Line 1: {value1}\n'
       f'Line 2: {value2}\n');  // ❌ f-strings not converted!

The parenthesized multi-line f-strings are not being joined and converted to template literals.

[swernerx]

Fixed in commit d868888. Multi-line f-string concatenation now works:

fmt = (f'Hello {name}'
       f'World {value}')

→

const fmt = \`Hello \${name}\` + \`World \${value}\`