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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 344a3d0bc0fb0868b519c3342b4982d6121eece3)

Options
Warnings
Boost 1.73.0
C++2a
no pedantic
Raw compiler options
-Wimplicit-float-conversion

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a -Wimplicit-float-conversion
prog.cc:11:15: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wimplicit-float-conversion]
    float f = 2.71828;          // C4305 'initializing'
          ~   ^~~~~~~
prog.cc:12:12: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wimplicit-float-conversion]
    item i(3.14159);            // C4305 'argument'
         ~ ^~~~~~~
2 warnings generated.
Exit Code:
2