gcc/clang "expected primary-expression before" in CI

The compiler reached a point where an expression was required but found something that cannot start one - often a type name used where a value was expected, or a missing operand.

What this error means

A parse error reports "expected primary-expression before" a token such as a type name, > or ), frequently after a template syntax or missing-argument mistake.

app.cpp:6:18: error: expected primary-expression before '>' token
    6 |   auto v = make<int>();
      |                  ^

Common causes

How to fix it

Supply a valid expression

1. Replace the type with a value, or fix the missing operand.
2. For dependent template calls, add the template disambiguator.

obj.template make<int>();   // template keyword for dependent name

How to prevent it

• Use values (not bare type names) where expressions are required and add the template keyword for dependent member templates.

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