carbon-language/carbon-lang
Call to local function inside generic function fails
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#6,793 opened on Feb 25, 2026
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Description
Description of the bug:
A call to a local function defined inside a generic function fails with a compiler error.
What did you do, or what's a simple way to reproduce the bug?
fn F(unused T:! type) {
fn Local() {}
Local();
}
What did you expect to happen?
This should compile successfully.
What actually happened?
The compiler cannot deduce the generic parameters of the enclosing function while deducing parameters of the local function.
// CHECK:STDERR: demo.carbon:[[@LINE+7]]:3: error: cannot deduce value for generic parameter `T` [DeductionIncomplete]
// CHECK:STDERR: Local();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: demo.carbon:[[@LINE-4]]:3: note: while deducing parameters of generic declared here [DeductionGenericHere]
// CHECK:STDERR: fn Local() {}
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
Any other information, logs, or outputs that you want to share?
No response