The compiler does not flag an error when two or more free functions (functions outside of a contract) with the same name and parameter types are defined in a source unit or when an imported free function alias shadows another free function with a different name but identical parameter types. This is due to a compiler bug introduced in v0.7.1 and fixed in v0.7.2. (see here)
- Free Functions Redefinition
- Free Functions -> Outside Contract
- Same Name/Parameters -> No Compiler Error
- Compiler Bug -> Fixed
solc 0.7.1-> 0.7.2